Kia’i Moku Column — Page 12 — Maui Invasive Species Committee (MISC)

Moving? Leave the pests behind

Posted on June 25, 2014 by Lissa Strohecker

Moving interisland, or even within the island, comes with the risk of bringing invasive species along MISC file photo

Ask anyone who has moved lately – it’s a daunting task. Every move, whether across town, across the state, or across the world involves choices: what to take and what to leave behind. Depending on where you are moving to and from, some of the “take it or toss it” decisions can have a major impact on the environment. Yes, you want to take your prized orchids, but what if they are carrying a pest you don’t want at your new home? Whether you are moving to the mainland or merely interisland, you should take steps not to bring trouble with you.

Hawai‘i is particularly susceptible to introductions of foreign species and each Hawaiian island is battling its own unique set of pests—plants, insects, or animals that are not found on the other islands. For example, fireweed is ubiquitous on the slopes of Haleakalā on Maui, but it’s on target for eradication on Moloka‘i and Kaua‘i. Red-vented bulbuls, a notorious agricultural pest common on O‘ahu, haven’t yet invaded Maui. How could one of these noisy birds find its way into your luggage? You’d be surprised.

Red-vented bulbuls are cavity nesters. While they most often nest in tree trunks, these opportunists have been known to squeeze into the ends of curtain rods or the tops of ceiling fans. These pestiferous birds are suspected of making it to the Marshall Islands as stowaways in a cargo container.

Less conspicuous than bulbuls are coqui frogs. These tiny hoppers can easily travel with potted plants. Gardening and yard

A notorious hitchiker, the coqui frog, hides in plants and cars. This frog goes through the tadpole stage inside the egg, meaning it's even easier to spread the frog. MISC file photo

A notorious hitchhiker, the coqui frog, hides in plants and cars. This frog goes through the tadpole stage inside the egg, meaning it’s even easier to spread the frog. MISC file photo

supplies like hoses, weed mats, and empty pots are perfect habitat for this noisy amphibian, so check twice before packing these things if coqui are already your neighborhood. If you do choose to bring plants or gardening gear, make sure they are clean and frog-free. Contact your local Invasive Species Committee for treatment information.

One of the tiniest yet most damaging interisland hitchhikers is the stinging little fire ant, now widespread in parts of the Big Island. An infested property can have millions of ants; one square foot can have over 1,800 worker ants with three to seven queens. It only takes one queen and fewer than a dozen workers to start a new colony. The ants can set up shop anywhere – a bed, macadamia nut shells, a computer or golf bag, so it’s easy to accidentally transfer a satellite colony to a new location. If you are moving from a little-fire-ant zone be sure you’re not packing a pest. Your family, pets, and new neighbors will appreciate it!

Shipping your car? Automobiles have been the source of new coqui populations. The small frogs find car bumpers and undercarriages the perfect place to amplify their calls. On a windy day, little fire ants rain down from trees into the beds of pickups and crevices of cars, coming along for the ride to find new habitat to invade. If you live in an infested area, check your car and consult the experts for how to rid these species from your belongings. That way you can move without compromising quiet nights and peaceful time outdoors.

Liitle fire ant colony inside a macadamia nut

Little fire ants have many queens in the colony, and by moving a queen the population spreads to new areas. If you live in an area infested with little fire ant, don’t bring the pest to your new home. Photo courtesy of Hawaii Department of Agriculture.

Are your pets moving with you? If you have a cat or dog, just check with the airline, but if your pet is on the “exotic” range of the spectrum—birds, chinchillas, rats, rabbits, guinea pigs, and even lizards—it should be cleared with the Hawai‘i Department of Agriculture. The Jackson’s chameleon, often kept as a pet on Maui, is not established on Lānaāi, Moloka‘i, or Kaua‘i. It’s an invasive species that can harm endangered Hawaiian snails and other native invertebrates if it becomes established in wild areas.

When you are researching a big move, take a few minutes to investigate how to avoid spreading unwanted species to your new home. If you are moving interisland, the island-based Invasive Species Committees are good sources of information. Call the local office or find out online what they are working to control. Any plant material should be inspected by the Department of Agriculture before going interisland. Find the contact for your local Plant Quarantine Office here: http://hdoa.hawaii.gov/pi/plant-quarantine-contacts/. Bring the memories – but leave the pests behind.

By Lissa Fox Strohecker. Originally published in the Maui News, March 9th, 2014 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee

Protecting the Northwest Hawaiian Islands from Invasive Species

Posted on June 25, 2014 by Lissa Strohecker

Laysan, a remote island in the Northwest Hawaiian Islands, is a refuge for seabirds. Strict decontamination protocols protect these islands from non-native species. Photo courtesy of Forest and Kim Starr

Stretching 1,200 miles across the Pacific, past Kaua‘i and Ni‘ihau, lies a sting of tiny islands and obscure atolls ringed by coral reefs. Though the total land area occupies only six square miles, the Northwest Hawaiian Islands host over 14 million nesting seabirds and provide the only habitat for four endangered land birds. The extreme isolation of the islands, and hence the relative lack of human presence, mean the Northwest Hawaiian Islands serve as critical refuges for the survival of coastal plants and animals now threatened or no longer present on the main Hawaiian Islands. But human presence has not been entirely lacking—military and private interests, and the plants and animals carried along, have left a lasting legacy on the islands.

Introduced species can have dramatic and devastating effects on the plants and animals that have evolved to live in such remote isolation, and the isolation can affect the way these species behave. Take the big-headed on Kure Atoll, which probably arrived as a stowaway with human cargo. On the main Hawaiian Islands and nearby islets, big-headed ants are a pest, but don’t seem to cause a measurable reduction in fledgling success of seabird chicks. Not so on Kure, where the density of these ants is five times greater than it ever was on Moku‘auia islet off O‘ahu before biologists eradicated the ant. The ants are so numerous on Kure they attack everything they encounter, including seabird hatchlings.

On Laysan, the intentional release of rabbits in 1902 caused the extinction of numerous plants and animals and three species of land birds found nowhere else in the world. The rabbits have since been eradicated and the atoll is still home to a number of endemic species, including the Laysan duck, a bird once widespread in Hawai‘i.

Lessons learned from the intentional and accidental introduction of non-native species have shaped the management practices for travel today. To protect some of the last remaining examples of intact native coastal habitat in Hawaii, along with millions of

The Laysan duck is a small dabbling duck that nearly went extinct due to invasive species. Today it is found on three of the Northwest Hawaiian Islands. Photo by Forest and Kim Starr

seabirds, land birds, and insects that live there, natural resource managers have taken steps to prevent hitchhiking plants and insects.

University of Hawai‘i early detection specialists Forest and Kim Starr know the drill. They have visited most of the islands in the Northwest Hawaiian Islands, conducting surveys of native and non-native birds, plants and insects. They’ve gone through rigorous preparations to ensure they’re not bringing unwelcome guests with them. In September 2013, the Starrs traveled to Laysan, one of the islands with the greatest levels of protection. “Everything, from boots and tents, down to the fabric sunglasses retainers has to be new,” Kim said, in accordance with procedures established by the Papahānaumokuākea Marine National Monument.

They freeze everything they pack for 48 hours to kill any insects or larvae and help sterilize any overlooked seeds. The strict decontamination protocols help prevent the spread of

Once found on the main Hawaiian Islands, The Laysan Finch is only found on a handful of atolls in the Northwest Hawaiian Islands. This ground-nesting finch is extremely vulnerable to introduced species like rats and ants. Photo courtesy of Forest and Kim Starr

biological material from the main Hawaiian Islands to these spectacular but vulnerable atolls. “Fewer people have been to Laysan than Everest,” explains Kim. Even food is restricted on the more isolated islands. Fresh fruit and vegetables are not permitted and food not in cans or jars must be frozen for 48 hours as well. All gear must be packed in plastic tubs and buckets, as cardboard or wood can harbor insect larvae.

To maintain some of the healthiest intact reefs in the world, divers must rinse all their gear in a mild bleach solution to remove fragments of invasive algae. Boats and ships must maintain clean hulls and exchange ballast water at sea. And all vessels must be free of rodents—one of the single greatest threats to ground nesting seabirds.

To protect the species found on the Northwest Hawaiian Islands, rigorous protocols help prevent “forward contamination.” Every island in Hawai‘i is unique; each has species found only on that island. You can protect the rare species of your island by taking simple measures to prevent spreading invasive species. Make sure potted plants and cut flowers are inspected by the Hawai‘i Department of Agriculture before you carry them interisland and that soft gear, like tents, boots, even the cuffs of your pants are free of seeds, insects, and other hitchhikers. To learn more about the Northwest Hawaiian Islands, look online at www.papahanaumokuakea.gov.

By Lissa Fox Strohecker. Originally published in the Maui News, February 9th, 2014 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

Aliens and Space Travel-Preventing Invasive Species from Reaching the Final Frontier

Posted on February 12, 2014 by Lissa Strohecker

No hugs and kisses yet. The astronauts on Apollo 11 spent nearly 2 weeks in a quarantine facility when they returned from their moon landing to ensure they were not carrying any lunar microorganisms. Looking through the window (left to right) Astronauts Neil Armstrong, Edwin Aldrin Jr., and Michael Collins. The wives are (left to right) Mrs. Pat Collins, Mrs. Jan Armstrong, and Mrs. Jean Aldrin. Photo Courtesy NASA.

When the Polynesians set out to find Hawai‘i, like all explorers, they did not know what they would find so they packed carefully, bringing food and other essentials to help them survive in the new land. Modern travelers do the same, whether heading to a new town or a new planet, yet, even with all the preparations, there are still surprises—sometimes in the way those essential items can affect the final destination.

This is the first in a series of three articles looking at efforts to protect the places we journey to from the things we journey with.

The farther you travel the more preparations you make. And for exploring the far reaches of our known universe, preparations take years. When the first astronauts walked on the moon, they were understandably more interested in what they would find than what they would leave behind. But the possibility of contaminating distant lunar or planetary bodies was on the mind of many scientists at the time. Contamination could compromise scientific experiments, invalidating any proof of life on anther planet. Or an organism from earth could become invasive—altering or destroying life on a distant planet.

With these concerns in mind, the U.S. National Academy of Scientists passed a resolution in 1958 urging scientists to “plan lunar and planetary studies with great care and deep concern so that initial operations do not compromise and make impossible forever after critical scientific experiments.” Soon thereafter, NASA’s planetary protection office was created, with a focus on preventing both forward contamination–earth microbes into space– and back contamination—alien microbes back to earth.

To reduce the likelihood of forward contamination, spacecraft are built in cleanrooms designed to reduce the amount of dust and bacteria landing on a spacecraft. Workers must wear protective clothing so they do not leave behind hair or bacteria. And once the spacecraft is built, it is sterilized, either by baking in a giant oven at 325˚F for 30 hours or by treating it with vaporized hydrogen peroxide.

The level of planetary protection varies by the type of mission and destination. For example, an orbiter mission to Mars has a lower probability of contamination than a probe actually landing on the planet, so the cleaning requirements would be less rigorous – what’s known in space lingo as acceptable levels of biological burden. .

And as for what comes back to earth? There are protocols for that as well. When the astronauts from Apollo 11 splashed down south of Johnston Atoll in the middle of the Pacific in 1969, the recovery crew passed biological isolation garments into the hatch and resealed it. Donned in their new attire, they climbed aboard rafts and were sponged off with bleach before entering a quarantine facility aboard the rescue ship where they were isolated for 2 weeks and observed for infections from lunar pathogens. Subsequent missions Apollo 12 and 13 had similar protocols, but NASA has since classified the moon as devoid of life and relaxed decontamination for lunar missions.

NASA’s planetary protection office is tasked with protecting life in the universe from accidental movement of organisms between celestial bodies. But the goal of planetary protection is not so different from the responsibilities facing the quarantine branch of the Hawai‘i Department of Agriculture, doing its best to prevent both forward and back contamination on our little planet of Hawai‘i. The impacts of alien contamination coming into our state can be catastrophic—think fire ants or snakes. You can do your part on your next exploration to reduce the “biological burden,” even if it just means brushing your boots before a hike or checking plants you bring onto your property to ensure you aren’t introducing an “alien” contaminants.

By Lissa Fox Strohecker. Originally published in the Maui News, January 12th, 2014 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

Roomba on the Reef–Native collector urchins on the prowl for invasive algae

Posted on January 21, 2014 by Lissa Strohecker Leave a Comment

A diver holds native collector urchin in his hand. Monitoring has shown these tiny urchins are successfully controlling invasive algae. Photo courtesy of Hawaii Department of Land and Natural Resources-Division of Aquatic Resources

Let’s say you are trying to remove tiny piece of invasive plant material from an area 8 miles long and almost 3 miles wide. If you miss any, it will take over again. And you are working under water.

This is the situation the Department of Land and Natural Resources-Division of Aquatic Resources (DAR) faces at Kāne‘ohe Bay on O‘ahu. An invasive algae, Kappaphycus spp., also known as smothering seaweed has overrun the reef causing a cascade of impacts. “They’re so aggressive they outcompete native limu [seaweed]; they grow so dense they kill coral and dominate habitat for tako [octopus] and small fish,” explains Jono Blodgett, aquatic species project leader with DAR.

First DAR tackled the alien algae with the Super Sucker, a giant vacuum mounted on a boat. Divers worked their way across the reef, sucking up the algae. Technicians would sort through it, tossing native limu back to colonize the reef, and bagging the invasive algae to give to local farmers to be used for compost. Unfortunately, gains were temporary–fragments of invasive algae left behind would regrow. DAR next called in native Hawaiian sea urchins with an appetite for invasive algae.

If the Super Sucker was a giant vacuum, native collector urchins (Tripneustes gratilla) are more like a Roomba, that small robotic vacuum that automatically cleans house floors. Once released, these spiny herbivores move across the reef munching algae as they find it. They would eat native limus as well, if the invasive algae hadn’t taken over all the natives.

Volunteers help rehome tank-raised native collector urchins to the reef in Kāne‘ohe Bay on O‘ahu. Photo courtesy of Hawaii Department of Land and Natural Resources-Division of Aquatic Resources

The first urchins were released by DAR in January of 2011 and they’ve proven their worth. Although this urchin is native to Hawai‘i, it wasn’t abundant enough on the reef to control the algae in Kāne‘ohe Bay. Their numbers used to be much greater in the Bay, but unknown reasons have caused their populations to decline. By elevating the urchin populations, resource managers are getting ahead of the invasive algae.

The urchins used are a native species, selected because they stay on the reef and munch algae day and night. Adult urchins are collected from the wild and bred in captivity. After juvenile urchins reach 15mm, typically within 5-6 months, they are sent to work: released in Kāne‘ohe Bay to settle out over the reef and eat to their hearts’ content. Currently 5000 urchins are released each month in Kāne‘oheBay.

Density numbers are still being analyzed, but initially, urchins are released at a density of two per square meter and once the algae are under control, one urchin per square meter keeps the reef maintained. With some patch reefs as large as 30,000 square meters, it will take a lot of urchins. “We’re hoping to double production by next year,” says Blodgett.

Native collector urchins dine happily on invasive alage in Kāne‘ohe Bay. Photo courtesy of Photo courtesy of Hawaii Department of Land and Natural Resources-Division of Aquatic Resources

Monitoring in Kāne‘ohe has shown that the collector urchins are effectively controlling invasive algae. Based on the success of the cleanup in Kāne‘oheBay, collector urchins could become invasive algae cleanup crews across the state. DAR has done trials to see if the urchins will control another alien alga: the gorilla ogo (Gracilaria salicornia) that plagues Waikīkī and much of Moloka‘i.

In the meantime, Blodgett advises leaving urchins and other herbivores alone and making sure dive and snorkel gear is free of any pieces of algae when you leave a site. Invasive algae spread through fragmentation, explains Blodgett, “Rinse gear before leaving a site.”

By Lissa Fox Strohecker. Originally published in the Maui News, December 8th, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

Tiny beetle bores down on Hawaii coffee industry

Posted on November 15, 2013 by MISC Leave a Comment

The tiny coffee berry borer beetle is seen here entering the coffee fruit. Coffee berry borer eats the coffee bean, reducing yield dramatically. In four months’ time one beetle will produce 40,960,000 beetles. This pest is only known to be on Hawaii Island and coffee farmers throughout the state are on the lookout. Never bring green coffee or plants between islands. Photo by Andrea Kawabata, UH CTAHR.

Hawai‘i is the only state in the United States where coffee is grown commercially, and Hawaiian coffee, often synonymous with Kona, is beloved throughout the world. Coffee farms have started springing up on Maui in recent years. “There are maybe 20 times more coffee farmers than 10 years ago,” says Sydney Smith, owner of Māliko Estate Coffee and president of the Maui Coffee Association.

But a tiny bark beetle from Africa, Hypothenemus hampei, or coffee berry borer threatens the coffee industry throughout the state. The miniscule pest was first detected in Kona in 2010. It spread like wildfire reaching north Kona, Ka‘ū, Hāwī, and Hilo. The beetle lays eggs inside of coffee berries. Its larvae hatch and begin to feed, hollowing out the bean and leaving little to harvest and roast.

“Once infestation levels exceed 50% of the cherries in the field, the coffee is not worth picking,” says Rob Curtiss, entomologist with the Hawai‘i Department of Agriculture (HDOA). He explained that there are farms on Hawai‘i Island with 80-90% infestation. “After [the beetles] are in the coffee [fruit] there is nothing you can do to kill them.”

People are responsible for spreading coffee berry borers, says Curtiss. Moving infested beans and bags moves the insects. A few infested beans in the back of a pickup truck could mean the introduction of the pest to a new farm—where the beetle population then explodes. Each female can lay 120 eggs, of which there are 10 females for every male. When the females mature, they find a new coffee fruit, tunnel inside, and lay eggs immediately. Their life cycle is approximately 27 days, most of which occurs inside the coffee berry. “Every 30 or so days you can multiply the infestation by about 80,” says Curtiss. “In four months’ time one beetle becomes 40,960,000 beetles.”

Coffee farmers in Kona have been working closely with entomologists and researchers at the Hawai‘i Department of Agriculture and the University of Hawai‘i-College of Tropical Agriculture and Human Resources (UH-CTAHR) to find effective ways to manage the infestation.

By combining several methods of control, some farmers on Hawai‘i Island have successfully reduced infestation levels to below 5%. This system of integrated pest management includes protocols for field sanitation, pruning, monitoring, pesticide application, harvest, and shipping. Instructions can be found in an online publication on the UH-CTAHR website titled “Recommendations for Coffee Berry Borer Integrated Pest Management in Hawai‘i 2013”

The long-term solution may lie in the discovery of an effective predator for the beetle. According to Curtiss, coffee berry borer is an ongoing target for biocontrol research for the Hawai‘i Department of Agriculture. The department’s exploratory entomologist may someday make a promising discovery in Africa, the beetle’s native range.

Currently, an interisland quarantine restricts the movement of coffee plants and unroasted or untreated “green” coffee from Hawai‘i Island to prevent the pest’s spread to other islands.

The coffee industry on Maui and throughout the rest of the state is growing, as this farm in Kaanapalli shows. But coffee berry borer threatens the entire state. Photo by Forest and Kim Starr.

Back on Maui, Sydney Smith has changed the way she runs her farm. “I used to give tours to visitors, but I don’t do that anymore…I’ve removed coffee plants from near our vacation rental.” Smith’s actions stem from concerns that a visitor may have toured an infested coffee farm on Hawai‘i Island and unknowingly be transporting a beetle. “They’re little tiny things that can get in shoes and clothes.”

Coffee berry borer has thus far only been detected on Hawai‘i Island, but Maui coffee farmers have been trained on what to look for. “It’s not if—it’s when,” says Smith.

To learn more about coffee berry borer, visit the UH-CTAHR webpage: www.ctahr.hawaii.edu/site/cbb.aspx and the HDOA webpage: hdoa.hawaii.gov/pi/ppc/cbbinfo/

By Lissa Fox Strohecker. Originally published in the Maui News, November 10th, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

And then the pollinator wasp arrived…

Posted on October 17, 2013 by Lissa Strohecker Leave a Comment

Bo tree, Ficus religiosa, is an attractive ornamental that was once safe to plant in Hawaii. Now the pollinator wasp for the bo tree is in Hawaii and this prolific seeder threatens watersheds. Photo by Forest and Kim Starr

Lori Buchanan, manager of Moloka‘i/Maui Invasive Species Committee (MoMISC), was in downtown Kaunakakai recently when she saw something strange sprouting out of the storm drain. It was a 3-foot tall seedling of a ficus—the very same tree she and her crew are working to remove from Moloka‘i.

Called the bo, peepul, or bodhi tree, Ficus religiosa is planted throughout Asia, Africa, and North America. According to legend, the Buddha sat beneath this species of tree when he meditated and attained enlightenment, hence it’s name. The Hindu deity Vishnu is reputed to have been born under a bo tree. These trees are often planted at Buddhist and Hindu temples. There is a bo tree at the Foster Botanical Garden on Oahu that is said to be a descendant of the tree under which Buddha sat.

Not that long ago, the bo tree couldn’t reproduce on its own in Hawai‘i; it only grew via cuttings. As a member of the Ficus family, it needs a specific wasp to pollinate its flowers in order to produce seeds. That wasp, Blastophaga quadraticeps, was not in Hawai‘i. The wasp crawls inside the minute flower to fertilize it. In 2007, when seedlings sprang up under the bo tree at Foster Garden, Hawai‘i entomologists knew the pollinator wasp had arrived.

Bo tree seedlings springing up out of a sidewalk crack on Molokai

Bo tree seedlings, like this one springing up out of a sidewalk crack on Molokai, indicate the pollinator wasp has arrived. Birds can easily spread seeds into the watershed. Photo by Forest and Kim Starr

The arrival of Blastophaga quadraticeps means that Hawai‘i has joined a relatively small list of places where Ficus religiosa can produce viable seed: India (where it’s native), Israel, and Florida. In Israel, the pollinator wasp fully invaded and Ficus religiosa now ranks alongside other Ficus as invasive and messy. Now that they produce fruit in Israel, purple figs stain the sidewalks, stick to shoes, and splatter cars left in the shade of a tree. Motorcyclists dodge slippery piles of fruit and beachgoers clean gummy residue off their gear.

On Moloka‘i, Buchanan isn’t worried about sidewalk saplings—she’s worried about the forests. “Birds spread the seeds and they [Ficus trees] can get into the forest and threaten the watershed,” she says. “They are prolific seeders and seedlings pop up wherever.” Bo tree could start to take over the native forest on Moloka‘i.

Ficus religiosa, like most Ficus, can grow almost epiphytically: a seedling doesn’t need soil initially but roots reach down until the find earth. Bo tree is technically more of a “splitter” than a strangler fig. Rather than smothering its host in roots, the seeds that sprout in the fork of a tree will send roots through the stem of the support tree, splitting it from the inside. It can find a home in sidewalks and drain sprouts, splitting those apart as well.

MoMISC is actively controlling this species on Moloka‘i, where less than a dozen trees

Bo tree can be recognized by the “tail” or drip-tip on the distinctive heart-shaped leaves. Photo by Forest & Kim Starr

were planted. Only one site with mature trees remains, and Buchanan and her crew are busy hunting down seedlings until the landowner agrees to have the plant removed. On other islands bo tree is planted widely enough that resources are too limited to remove it. But choosing to not plant this tree will slow its spread.

You can help MoMISC by keeping an eye out for bo tree seedlings in Central Moloka‘i, specifically in Kala‘e and Kaunakakai. The bo tree has distinctive heart shaped leaves that extend at the tip. According to Buchanan, the plant most closely resembles the Polynesian “canoe plant” milo, which also grows in the same areas on Moloka‘i. Bo tree has more dark green to grey glossy leaves. Any sightings of bo tree on Moloka‘i should be reported to MoMISC, 954-6585.

By Lissa Fox Strohecker. Originally published in the Maui News, October 13th, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

“Devil weed” sneaks into Hawaii

Posted on September 9, 2013 by Lissa Strohecker Leave a Comment

They saw the pitchfork leaf pattern and knew something was amiss. The unmistakable smell

Devil weed, or Chromolaena odorata growing along a trailside in the Kahuku Motocross Riding Area. This invasive plant is new in Hawaii and only known to be in the Kahuku area. Photo courtesy of Oahu Army Natural Resources Program.

of turpentine in a crushed leaf only added to concern. In January of 2011, a field crew with the O‘ahu Army Natural Resources Program (OANRP) was searching roadsides of the Kahuku training area on the north shore of O‘ahu. They noticed an unusual plant they had not seen before. Could it be devil weed? They sent a sample to specialists with the O‘ahu Invasive Species Committee. Their suspicions were confirmed. Devil weed, or Chromolaena odorata, lives up to its name: it has earned a place on the Invasive Species Specialist Group’s list of the worlds’ 100 worst invaders, alongside coqui frogs and brown tree snakes. The diabolical weed has already invaded Southeast Asia, parts of Africa, and Guam, and has now made to Hawai‘i.

The pitchfork pattern found in the veins on the leaf of devil weed is a key feature of the plant. Photo courtesy of Oahu Army Natural Resources Program.

Native to North America, devil weed is not a pest in its home range, possibly kept in check by natural enemies. Found throughout Florida, Texas, Mexico, and the Caribbean, it attracts butterflies and bees with its fragrant flowers and goes by the much more innocent name of Jack-in-the-bush or blue mistflower. But elsewhere around the world, devil weed causes despair.

A pest in fields, pastures, and wilderness areas, this tangled shrub is fast growing and fertile, covering a foot each week a day. A single plant can make 800,000 seeds. Not surprisingly, it quickly smothers crops and native vegetation. Toxic to animals, it takes over pastureland as well. The bitter oils in the plant that render it toxic are volatile and infestations of this pest fuel wildfires. As devil weed rapidly invades disturbed areas, a fire cycle begins. In Hawai‘i , where ecosystems are not adapted to regular fires and native plants do not regenerate as fast as some invasive species a cycle of fire can mean the end of native habitat, particularly on the leeward sides of the islands.

Best estimates indicate that devil weed is a recent arrival; surveys in the area in 2009 and 2010 did not detect it. Today it is scattered over 900 acres of the Kahuku training area. Julia Parish, the manager of the O‘ahu Invasive Species Committee (OISC), says it’s possible to eradicate Kahuku populations, “But there’s a high risk for reintroduction on private vehicles coming in from across the Pacific region. [U.S.] Customs regularly intercepts Chromolaena on contaminated equipment and vehicles.”

OISC, along with OANRP, Hawai‘i Department of Agriculture, the University of Hawai‘i , and Hawai‘i Department of Land and Natural Resources have teamed up to address devil weed in Hawai‘i .

A single devil weed plant can produce up to 800,000 tiny seeds that are easily spread in mud and equipment. Photo courtesy of Oahu Army Natural Resources Program.

The Kahuku training area is the weekend home of the KahukuMotocrossPark, and 400 acres of trails weave through the area. Kahuku is also popular with hunters and dirt bikers. OISC has been working closely with the Hawai‘i Motocross Association to get the word out about this demon to prevent further spread. According to Parish, “There is an extremely high likelihood of Chromolaena being on other islands.” Bikes move between islands for competitions. The tiny seeds can easily move in the mud on tires or boots.

Finding devil weed early can be tricky, as it resembles other plants. Look for a shrubby plant,

Flowers of devil weed can be lilac to white in color and often have a tangled appearance. Photo courtesy of Oahu Army Natural Resources Program.

sometimes sprawling, with very-triangular leaves, serrated at the edge. The leaf veins form a distinguishable pitchfork pattern and have a turpentine-like smell when crushed. The stems are covered in short soft hairs and older stems are woody. Single flowers resemble a tangled lilac puffball and flowers grow in clusters. The Seeds have a feathery parachute to carry them on the wind.

You can help prevent the introduction of devil weed and other invasive plants. Always clean hiking and sports equipment, and vehicles and gear before bringing them interisland–even between different areas of the island–particularly if covered in soil or mud. Not only will you help prevent the spread of invasive species, your gear will last longer. If you suspect you may have seen devil weed on Maui, call MISC at 573-6472 or email miscpr@hawaii.edu. On other islands call your island-based invasive species committee.

By Lissa Fox Strohecker. Originally published in the Maui News, August 8th, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

The public health threat of invasive species-mosquitoes and dengue

Posted on August 23, 2013 by Lissa Strohecker Leave a Comment

Aedes aegypti is famous the world over for spreading dengue. This species is not established statewide, but it has shown up at the Honolulu International Airport five times since January of 2012. Photo by Muhammad Mahdi Karim

Back in 2001, several East Maui residents started reporting fever, body aches, and rashes. One of the people sickened had just traveled in French Polynesia during a dengue fever outbreak. The Department of Health eventually confirmed 20 cases of dengue fever in East Maui and a crew hired with funds allocated for environmental emergencies went to work removing mosquito habitat. What made this outbreak interesting was that it was spread by the tiger mosquito, Aedes albopictus, common in Hawai‘i.

“We may be the only place in the world to confirm [that] dengue could be spread by the albopictus mosquito. It’s not an efficient carrier of the disease,” explains Gary Gill, Deputy Director of the Environmental Health Administration with the Hawai‘i Department of Health. “In places where dengue is endemic [regularly occurring], it is the aegypti mosquito that is the carrier.”

The invasive mosquito, Aedes aegypti, is famous for spreading dengue. Neither the mosquito nor dengue is widespread in Hawai‘i. Both periodically appear, but luckily not at the same time. Though conditions are prime as Hawai‘i is a global hub for tourism and commerce..

Dengue outbreaks in Hawai‘i are rare and typically occur when someone travels to an infested area, returns to Hawai‘i and is bitten by a mosquito, as happened in 2001. According to Gill, immediate family members and neighbors are at risk, but the common tiger mosquitoes rarely eat from more than one source. The female mosquito finds a person (or animal), and, given the chance, feeds until her belly is about to burst.

In contrast, Aedes aegypti flit from person to person, taking a blood meal from multiple people and spreading any disease carried by the bloodsuckers. Aedes aegypti is not normally found on O‘ahu. “We have not, up until last year, identified any aegypti since the 1940s,” says Gill.

In January of 2012, a Department of Health entomologist collected a trap containing what was later identified as Aedes aegypti at the Honolulu International Airport. “We’ve found aegypti five times in the last year. Every indication is that this mosquito is either living and breeding at the airport, or it is regularly being reintroduced,” Gill says. Mosquitoes can survive in the cabin, cargo hold, or underbelly of an airplane coming from an infested area. Aedes aegypti are originally from Africa but have spread to tropical and sub-tropical regions of the world including Mexico, Asia, and Australia.

Dengue fever is a widespread subtropical disease that is continuously present in areas with established population of Aedes aegypti. This map shows the distribution of Aedes aegypti (blue) and Aedes aegypti and dengue fever (red). Image from Centers for Disease Control

From a public health standpoint having a thriving population of dengue-spreading mosquitoes at the airport is a worst case scenario according to Gill. “A person carrying the virus walks through the airport, and then it spreads to any number of people at the airport who will then take it to wherever they are going. A single population of aegypti could easily spread dengue throughout the state. A dengue-carrier mosquito would be a concern for people who come here as much as for people who live here.” If Aedes aegypti became established throughout Hawai‘i, it would set the stage for a consistent presence of dengue, like does in parts of Central and South America, India, Southeast Asia, and Africa.

Ongoing surveys for mosquitoes are the best way to ensure early detection of this species. The Department of Health continues to monitor mosquitoes at Honolulu International Airport, but surveys are limited to that airport and don’t include surrounding areas. Funding cuts in 2009 gutted the Department of Health. At one point 40 people worked on O‘ahu on environmental health but now only seven positions remain. Staff cuts throughout the state have left no capacity for mosquito monitoring elsewhere. “What’s at Kahului? We have no idea,” worries Gill.

The Department of Health is working with Hawai‘i’s Departments of Agriculture Transportation to explore options for mosquito surveys at airports and harbors statewide. They are working to reduce mosquito habitat at the airport, removing bromeliads and dark undergrowth and replacing it with less mosquito-friendly landscaping. Gill encourages homeowners to do the same, along with removing or changing water in outside open containers every week. For now it’s our best hope. Unless and until capacity is restored at the Department of Health, early detection of this devastating mosquito is up to the public.

By Lissa Fox Strohecker. Originally published in the Maui News, August 11, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

Hawaiian land snails– a tale of evolution worthy of protection

Posted on July 22, 2013 by Lissa Strohecker Leave a Comment

The tale of Hawaiian land snails began millions of years ago as the first plants and animals began to colonize the islands. Researchers don’t know exactly how snails arrived – perhaps stuck to the feathers of a bird or on a floating tree trunk. But in a remarkable story of evolutionary radiation, some 21 or more of those first species that arrived over the millennia gave rise to more than 750 distinct species. Of those, 99% are endemic to Hawai‘i – found here and nowhere else.

This species of Newcomb’s tree snail used to be widespread on Maui but today is only known from a handful of places in the West Maui Mountains thanks to habitat loss and invasive predators-rats and the rosy wolf snail. Baby snails, like this one riding on mom, are rare. Photo courtesy of Hank Oppenheimer

Famously varied in color and shape, Hawaiians called them pūpū kuahiwi, or high-hill snails. Early Europeans collected these jewels of the forest, selling them as lei or to collectors. These snails are still highly valued. Current efforts focus on saving remaining species; high-elevation snail refuges are built to protect them.

Often native snails are found only on one island, or in a single valley or ridge, teetering on extinction because of habitat destruction, shell collection, and invasive species. Adding to the challenges, many Hawaiian land snails reproduce at what is truly a snail’s pace: some species are 3-7 years old at first reproduction and have only 4-7 young per year. They grow slowly—only 0.2 to 0.4 cm a year. Compare this to the invasive giant African snail (Achatina fulica) which reproduce at one year of age, lays up to 600 eggs annually, and grows about 2.5 cm per year.

One species of snail endemic to Maui, Newcomb’s tree snail or Newcombia cumingi, was once found from Lahaina to Makawao, but like most land snails, has become increasingly rare during the latter half of the 20^th century. It was last seen in 1938 by Bishop Museum researchers then rediscovered in 1994 by resource managers with the Maui Land and Pineapple Company’s Pu‘u Kukui Watershed Preserve (PKW).

“One hundred years ago they [native snails] were everywhere,” explains Dr. Kenneth Hayes, a University of Hawai‘i researcher who, along many others, has been working to find out how many West Maui snails remain. Today, 50 percent or more are gone, many turned into escargot for invasive predators—rats, Jackson’s chameleons, and the rosy wolf snail. According to Hayes, the remaining native snails have mostly been relegated to the few areas that still contain native forest, but even these refuges won’t last long if we don’t stem the tide of invasive species. Native snails dine primarily on the fungi that grow on native plants. Invasive plants change the way water moves through Hawaiian watersheds altering the ecosystem by changing what plants, animals, fungi or microbes can live there. The snails’ preferred fungi may not grow in altered habitats.

Pomaikai Kaniaupio-Crozier, conservation manager with PKW, is leading efforts to protect the Newcombia. With US Fish and Wildlife Service funding and partner help they are planning an exclosure in the native forest of West Maui to keep hungry predators from munching native snails.

The West Maui “snail refuge” will be modeled after similar exclosures on O‘ahu, where the O‘ahu Army Natural Resources Program has enclosed three areas to keep out rats, chameleons, and even the predatory rosy wolf snail. A 4-foot tall sheet metal fence topped by a curved lip deters rats and chameleons. Predatory snails face sheet metal at an impossible-to-scale 10 degree angle– if they do manage they hit an electric wire. One fence is equipped with an electronic sensing system that alerts managers via text message if debris falls on the fence.

The first step in protecting Newcombia is a population survey. “They are the size of a pinky fingernail and very cryptic,” says Kaniaupio-Crozier. “It’s like finding the needle in the haystack, looking for something that small in 8,600 acres. Up until a couple months ago we were getting pretty demoralized.”

Then they made a remarkable discovery. They found a new population, in totally unexpected habitat. The existing Newcombia population inhabited a wet area with lots of ‘ōhi‘a; the new population was found on ‘ākia, in much drier terrain. “There’s hope there may be another population somewhere else.”

From survey to construction, building the snail refuge will take several years. You can help. PKW is welcoming people interested in habitat restoration, monitoring, even joining in the brainstorming. Contact Kaniaupio-Crozier at pkaniaupio-crozier@mlpmaui.com or by phone, 870-4225. To learn more about the native and non-native land snails of Hawai‘i, contact Ken Hayes, khayes@hawaii.edu, Norine Yeung, nyeung@hawaii.edu, or visit the Hawaiian Land Snail Conservation Facebook Page.

As with many conservation projects, the snail exclosure at Pu‘u Kukui involves many agencies and partners: US Fish and Wildlife Service, National Science Foundation, University of Hawai‘i Mānoa, O‘ahu Army Natural Resources Program, Department of Land and Natural Resources, Plant Extinction Prevention Program, and more.

By Lissa Fox Strohecker. Originally published in the Maui News, July 14th, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

Predator proof fences: Creating “islands” of protection in the Hawaiian Islands

Posted on July 1, 2013 by Lissa Strohecker Leave a Comment

Sometimes, fences bring freedom.

In Hawai‘i, habitat loss and invasive species have left little room for native plants and animals. And feral cats and dogs attack seabirds. Rats and mice steal eggs from endangered birds and snack on the seeds of rare plants. Introduced snails and chameleons have munched rare native tree snails close to oblivion.

Albatross chicks, like this one on Midway, are becoming an increasingly common sight on O‘ahu at Ka‘ena Point now that a predator-proof fence protects them.

At Ka‘ena Point on the northwest tip of O‘ahu, the Department of Land and Natural Resources tried to protect nesting habitat for seabirds. They closed off the area to motor vehicles and began trapping rats and other predators. It helped—Laysan albatross (mōlī) and Wedge-tailed shearwaters (‘ua‘u kani) began nesting among the native plants and in the dunes of this coastal ecosystem.. In 2011 over 3,000 shearwaters chicks hatched; and by 2012, 61 pairs of albatross took turns sitting atop their single egg. Unfortunately, control efforts only reduced the number of predators; it didn’t stop them. In a typical year, 15% of seabird hatchlings were killed. Periodically, stray dogs wandered into the reserve with catastrophic results. In 2006, 113 shearwaters were killed in a single night. The Department of Land and Natural Resources decided to build a fence.

Predator-proof fencing has been used extensively in New Zealand, but has only recently gained favor in Hawai‘i. It offers a promising solution for ongoing struggles like those at Ka‘ena. Rather than ongoing trapping to remove predators, resource managers can create protected “islands” where native plants and animals have a chance to recover.

The Hawaiian Petrel or ‘ua‘u is one of several species that cold benefit from a predator proof fence on West Maui. Photo by Jay Penniman

On Maui, two fenced enclosures are currently being built on the windward side of the West Maui Mountains at Makamaka‘ole. One is for Newell’s shearwaters, or ‘a‘o, and the other is for Hawaiian petrels, or ‘ua‘u. Both species nest in underground burrows and are vulnerable to attack by rodents, mongoose, and feral cats. The fences are designed to keep these hungry creatures out. First Wind, which built Kaheawa wind farm, is creating the four-acre enclosures as part of their seabird mitigation program to address impacts caused by the towers.

The Makamaka‘ole fences will be similar to the one at Ka‘ena. The mesh on these predator-proof fences is so small that even two-day old mice can’t crawl through. The fence will be topped with a metal hood to keep any animals from climbing over, and a skirt extends along the base to keep animals from burrowing under.

Once the first enclosure at Makamaka‘ole is complete, invasive animals will be removed and sound systems will be installed that broadcast seabird calls to attract prospecting birds. If they land to investigate, they may find home in one of the 50 artificial burrows. Erica Thoele, supervisor of habitat conservation plan compliance with First Wind, says, “Hopefully they’ll think this is a safe place and build a nest,” says Thoele. Crews will trap for predators along a 100 yard perimeter outside the fence in case any seabirds decide to nest nearby. Ongoing monitoring will help evaluate whether seabirds are using the artificial burrows or digging their own nests in the enclosure.

Monitoring at Ka‘ena Point has shown promising results. The 700 yard fence was completed in March 2011 and protects 59 acres of coastline from predators. There have been dramatic increases in seabird productivity now that the rats have been removed- a 25% increase in the number of albatross nesting at Ka‘ena, and a doubling of the number of Wedge-tailed shearwater chicks fledging. Native plants are also showing signs of recovering with more abundant fruits, seeds and seedlings than had been observed prior to removing predators. The fences may keep the hungry critters out, but well-behaved humans are still welcome at Ka‘ena. Double-door gates along the fence allow access to the reserve.

Fencing projects elsewhere in the state are in the works. The Oahu Army Natural Resources Program built “snail” fences to protect rare native snails from rats, mice, Jackson’s chameleons, and the invasive rosy wolf snail. A new fence will be built next year at Kīlauea Point National Wildlife Refuge to enclose nearly eight acres of habitat for six different species of breeding seabirds. Plans are in process for a fence on Lāna‘ihale to protect ‘ua‘u nesting habitat. Learn more about predator proof fencing at Ka‘ena by visiting the website hawaii.gov/dlnr/chair/pio/nr/2011/NR10-225.pdf

By Lissa Fox Strohecker. Originally published in the Maui News, June 9th, 2013 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

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