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The little fire ant-bad news for food crops

Posted on June 30, 2014 by Lissa Strohecker

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.

The little fire ant, Wasmannia auropunctata, is a pest with a deservedly nasty reputation. Alone, this wee ant is neither aggressive nor impressive, but with her sisters, living in a network of colonies stretching from tree-top to ground, she has a dramatic impact. Once established, little fire ants are more than a pest, they will put the kibosh on agriculture. Little fire ants have already shut down fruit orchards in the Hilo area and their establishment threatens agriculture throughout the state.

Little fire ants do not compete between colonies; rather, they cooperate, blanketing the ground and trees and outcompeting other ant species for food and resources. Other insects and animals may also be pushed out and end up abandoning highly-infested areas to the little fire ant.

As little fire ants find homes in bananas, citrus, rambutan, and coffee trees, farmers faced with new difficulties in harvesting their crops. Because the ants don’t hold on well to branches, scads of tree-dwelling ants rain down on workers become trapped in their clothing, and sting in self-defense.

fungus on coffee infested with little fire ants

Stinging ants raining down upon harvesters is enough of an obstacle for coffee infested with little fire ant, but additionally, yields are reduced because little fire ants protect aphids that support plant disease, like this fungus. Photo by Cas Vanderwoude

In the Galapagos, little fire ants have made harvesting coffee one of the most difficult ways to earn a living; coffee harvesters now command a higher wage than other agricultural workers to compensate them for the aggravation. Increased costs affect farm profitability; in several areas of the Galapagos, coffee plantations lay abandoned because of the little fire ant. In Kona, the famed coffee-growing area, and elsewhere in the state, most coffee is harvested by hand. The spread of LFA into coffee plantations will be a huge blow to an industry already struggling to address the coffee borer beetle, another invasive pest that threatens the coffee industry as it reduces yields.

Little fire ants threaten more than just coffee. In Brazil and Cameroon, little fire ants infest cacao farms. In Puerto Rico, Florida and New Caledonia, little fire ants have overrun citrus

Cacao and other tree crops are particularly susceptible to little fire ant infestations. Photo used by permission from Cas Vanderwoude.

Cacao and other tree crops are particularly susceptible to little fire ant infestations. Photo used by permission from Cas Vanderwoude.

groves and in some areas practically blanket the ground.

The ants are causing havoc with other types of agriculture as well. Little fire ants cause blindness in animals and livestock, poultry, and pets in infested areas have a much higher incidence of blindness than do animals without LFA.

Controlling these ants is extremely difficult, especially for tree crops, as few pesticides are registered for use in trees and the bait must stick to branches long enough for the ants to find it. Existing control techniques rely on traditional pesticides; an effective organic method has yet to be developed.

As with any invasive species, preventing spread and establishment are the most cost-effective approaches.  Eradication is possible only if the population is small. Once established, these ants may be forever.  Little fire ants are widespread on the eastern side of Hawaii Island and beyond eradication in that area, but further spread throughout the state can be prevented. Help protect agriculture on Maui, as well as your own quality of life. Support efforts to prevent their movement between islands and quarantine and check any plants or soil you bring on to your property for little fire ants. Learn more at www.lfa-hawaii.org and www.littlefireants.com.

By Lissa Fox Strohecker. Originally published in the Maui News, May 13th, 2012 as part of the Kia‘i Moku Column from the Maui Invasive Species Committee.

Filed Under: Invasive Animals, Kia'i Moku Column, Little Fire Ants, MISC Target Species Tagged With: 2012, coffee threats, little fire ant

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

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

Filed Under: Decontamination, Kia'i Moku Column, Little Fire Ants Tagged With: 2014, coqui, little fire ant, moving from big island, moving interisland in Hawaii

Residents urged to report unusual stinging fire ants

Posted on October 11, 2011 by Lissa Strohecker 2 Comments

An infestation of the much-dreaded little fire ant (LFA), Wasmannia auropunctata, was discovered on a farm in Waihee, Maui, in early October of 2009, the first known LFA foothold on the island. As reported in the Oct. 16 Maui News, Hawaii Department of Agriculture (HDOA) will be working with the owner to eradicate the ½-acre infestation; LFA may have been at this site for a year. These tiny pale-orange ants deliver painful stings that develop into large red welts; some people are more sensitive to them than others. LFA may be perceived by many as less of a threat than the red imported fire ant but is nevertheless a very serious pest that can attain high densities, and its powerful sting poses problems for domestic animals, wildlife, agricultural workers and others who come in contact with it.  When populations build up outdoors, they eventually come indoors and sting people in their homes. In this regard it is actually worse than the other “imported fire ants” on the mainland.

lfa colony inside mac nut shell-HDOA

An entire colony of the little fire ant can fit inside a macadamia nut shell. Photo by Hawaii Department of Agriculture

Native to South and Central America, LFA has invaded locations in West Africa, Florida, the Galapagos Islands, several Pacific island nations (New Caledonia, Wallis and Futuna, Solomon Islands, Vanuatu, and Tahiti), Israel, and Australia.

Though LFA was first detected in Hawaii on the Big Island in March 1999, it is believed to have been there for at least four years before it was discovered; a lag between invasion and detection is regarded as “normal.” In retrospect, LFA likely had reached Hawaii from Florida; genotypes of Hawaii LFA are essentially identical to some LFA specimens from the Lake Placid area of central Florida. As soon as LFA was discovered in Puna in 1999, HDOA realized the seriousness of the situation. They developed a pest advisory and assigned an entomologist to lead efforts to address this new invasion, involving detection, experimental efforts at eradication of local populations, and inter-island quarantine.

A 2005 review of HDOA’s efforts to address this serious ant pest suggested that they were “hindered by low staffing levels; lack of public and commercial awareness; lack of access to nursery sales records; the difficulty of detecting this ant; lack of a registered ant control product for use in orchard fruit and vegetable crops; the failure of most people to take the threat of its invasion seriously. HDOA demurred from an all out eradication effort and enactment of an intra-island quarantine to prevent infected nurseries from selling plants.”  The fact that some plant nurseries were infested and probably selling infested plants made containment virtually impossible.  By September 1999, LFA was known to occupy 30 acres in three populations. By January 2004, there were known to be 31 populations totaling nearly 200 acres; eight of the populations at that time involved nursery infestations and the nurseries were still selling plants. LFA is currently coalescing in Hilo and Puna, much as coqui frogs are doing.

Don't confuse the little fire ant with the much larger and widespread tropical fire ant

Don't confuse the little fire ant with the much larger and widespread tropical fire ant (above). Photo courtesy of HDOA

Maui has been determined to keep this ant out. Early detection efforts have been underway here for almost a decade, some involving students in intermediate and high schools. HDOA has implemented largely effective interisland quarantine that has at least helped to delay the infestation for a decade. What’s next?

Maui residents have shown impressive resolve in keeping the coqui frog confined to a relatively few areas, and coqui eradication is still considered a possibility. Most on Maui consider LFA a much more serious pest than coqui. We have the advantage of being able to learn from the Big Island’s experience. Obviously, the community needs to play a major supporting role if there is to be hope of sustained LFA eradication. One way to prevent LFA from being established is to report unusual stinging ants.  True to their name LFA are small, about as long as a penny is thick, with a sting disproportionate to their size.  Please call HDOA at 873-3962 or MISC at 573-6472 if you think you may have found LFA.

Will Maui citizens be able to pull together to effectively address the LFA threat?

Visit www.lfa-hawaii.org to report an infestation or www.littlefireants.org to learn more.

By Committee Member Lloyd Loope. Dr. Loope is a research scientist with the U.S. Geological Survey stationed at the Haleakala Field Station.  He holds a doctorate in botany from Duke University and is an active member of the Maui Invasive Species Committee.

Originally published in the Maui News, September 14, 2009 as part of the Kia‘i Moku Column.
You can find all the articles in the Kia‘i Moku series
http://www.hear.org/misc/mauinews/

Filed Under: Get Involved!, Invasive Animals, Kia'i Moku Column, Little Fire Ants, MISC Target Species Tagged With: little fire ant, wasmannia auropunctata

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