Fire Ants: What Happens to Them in a Flood?

Fire Ants: What Happens to Them in a Flood?
CT Scanning Shows how Fire Ants Interlock to Form Floating Rafts – Entomology Today, June 12, 2014

Flooding has been a problem in central Texas and occasionally in parts of Georgia. Floods impact fire ants, but perhaps not like we would wish or think!

Following info from Urban IPM blog by Wizzie Brown, Texas A&M Entomologist.

Red imported fire ants live in the soil.  What happens to them when we have flooding?  Many people may think that they will drown in the flood water.  Unfortunately this isn’t true.

Floating Fire Ants

When fire ant colonies are flooded, the ants form living rafts by clinging together.  They float along the water surface until they hit dry ground, a tree, rock or other dry object.  Once they come into contact with a dry area, they emerge from the flood waters and take shelter anywhere possible until they can re-create a colony in the soil.  Living rafts of fire ants can take on different shapes from long ribbons to mats to a ball of ants.

Any floating mats of fire ants that are encountered should not be touched or disturbed.  Do not touch them with sticks or other objects as the fire ants will quickly grab onto the object. If working in flooded areas, make sure to wear appropriate clothing.  Long sleeves, pants and gloves will create more of a barrier against fire ants reaching skin where they will bite and sting.  Be aware that fire ants could be hiding anywhere that was flooded.  Wear gloves when picking up debris or other objects.  You may want to spray insect repellent containing DEET on your shoes and pants.

If you encounter fire ants in debris, use a fast-acting contact pesticide labeled for ants, but make sure the products are not sprayed into water as they can be toxic to aquatic organisms.  Fire ant baits should not be used after flooding because many of them are slow acting and colonies will be disorganized and not foraging for food.

Also be aware that fire ants may be showing up in areas that may have not had them previously or areas that were treated.

Get updated on fire ant baiting

Get updated on fire ant baiting

Article written by Mike Merchant, Texas A&M Agrilife Extension Entomologist, in his blog Insects in the City

Fire ants remain the most prevalent outdoor ant pest in most areas of the southern U.S.  Throughout the U.S. we estimate the annual cost of fire ant control at over $6 billion.  But the cost of this pest goes far beyond measurable dollars.  Fire ants reduce the recreational value of our parks and backyards, disrupt wildlife populations, and send thousands to emergency rooms each year from their painful stings.

So as we get ready to enter fire ant season, it may be a good time to bring yourself and your staff up to speed on fire ant control. Many people are surprised to learn that fire ants are not an especially difficult pest to manage, once the biology and control tools are understood.

One of the best places to learn about fire ant management is the eXtension fire ant website, a place where the best information about fire ant is assembled by Extension agencies throughout the South. This information was recently summarized and presented in an informative webinar by Dr. Fudd Graham, fire ant specialist with Auburn University.   Dr. Graham focuses on fire ant biology and use of baits for fire ant control.

It’s worth knowing something about how fire ant baits work because they are the most economical, ecologically friendly, and effective control methods for fire ants. The webinar will provide you or your technician with an hour of training that should pay for itself many times over.


 

Mike Merchant is an entomology specialist for Texas AgriLife Extension. He works with pest management professionals, school facilities managers, extension volunteers, researchers and other extension professionals. His areas of specialty center on research on insects affecting man including spiders, scorpions, fire ants, termites and others. His program also focuses on training school maintenance professionals in principles of integrated pest management (IPM). His goal is to make schools healthier, cleaner places to study and live.

Get updated on fire ant baiting

Get updated on fire ant baiting

Article written by Mike Merchant, Texas A&M Agrilife Extension Entomologist, in his blog Insects in the City

Fire ants remain the most prevalent outdoor ant pest in most areas of the southern U.S.  Throughout the U.S. we estimate the annual cost of fire ant control at over $6 billion.  But the cost of this pest goes far beyond measurable dollars.  Fire ants reduce the recreational value of our parks and backyards, disrupt wildlife populations, and send thousands to emergency rooms each year from their painful stings.

So as we get ready to enter fire ant season, it may be a good time to bring yourself and your staff up to speed on fire ant control. Many people are surprised to learn that fire ants are not an especially difficult pest to manage, once the biology and control tools are understood.

One of the best places to learn about fire ant management is the eXtension fire ant website, a place where the best information about fire ant is assembled by Extension agencies throughout the South. This information was recently summarized and presented in an informative webinar by Dr. Fudd Graham, fire ant specialist with Auburn University.   Dr. Graham focuses on fire ant biology and use of baits for fire ant control.

It’s worth knowing something about how fire ant baits work because they are the most economical, ecologically friendly, and effective control methods for fire ants. The webinar will provide you or your technician with an hour of training that should pay for itself many times over.


 

Mike Merchant is an entomology specialist for Texas AgriLife Extension. He works with pest management professionals, school facilities managers, extension volunteers, researchers and other extension professionals. His areas of specialty center on research on insects affecting man including spiders, scorpions, fire ants, termites and others. His program also focuses on training school maintenance professionals in principles of integrated pest management (IPM). His goal is to make schools healthier, cleaner places to study and live.

Dealing with Fire Ants in the Community Garden

Fire Ants are a hazard in any vegetable garden. They can do some damage to food crops, maybe the occasional nibble in a potato or pea pod. The biggest problem is the damage they can do to gardeners! The ant stings are painful and can be a serious medical issue.

Dealing with Fire Ants in the Community Garden
Fire Ants from Stinging and Biting Pest by Elmer Gray

Entomologists agree that fire ants came in to this county through Mobile, Alabama in the early 1900s. Today, the red imported fire ant (Solenopsis invicta), black imported fire ant (Solenopsis richteri), and their hybrids are what we have to deal with. See the UGA Publication Stinging and Biting Pests for more background information.

Fire ant stings are so painful because the ant’s mandibles allow the insect to grab on to the victim as the ant stings. The stinger can be used more than once and afterwards the insect is not impacted and goes on to live another day.

Ants do prey on some garden pests, like caterpillars. However, they also assist other damaging insects like aphids by keeping natural enemies away.

Controlling fire ants in the community garden can be a challenge. It takes an on-going approach and the use of several methods, real integrated pest management(IPM).

Dealing with Fire Ants in the Community Garden
Photo from UGA’s Department of Entomology

Fire ants like full sunshine, just like your vegetable plants. However, they don’t tend to stay in areas that are disturbed. Garden plots that are frequently worked or compost piles that are frequently turned aren’t the ants first choice of habitat.

Some publications recommend pouring boiling water over the mounds. A supply of boiling water would be hard to come by in a community gardening setting. Also, it could be a real danger to the gardener and the vegetable plants. Digging out the mounds is also sometimes recommended. This could create very angry ants that would be inclined to attack the digger.

Fall is a good time for chemical controls.  Products containing carbaryl (Sevin), pyrethrins, and pyrethrins plus diatomaceous earth are approved for use in vegetable gardens and will kill fire ants. Be aware these products are not selective and will affect other insects as well. READ THE LABEL of any product you use and follow those directions.

Controlling Fire Ants in the Vegetable Garden, a Clemson University publication, discusses bait products approved for use in the home vegetable garden. Products containing spinosad or pyriproxyfen can be effective when used according to label instructions.  Spinosad effects the ant’s nervous system and  is considered fast acting. Pyriproxyfen prevents the development of worker ants. Products containing these ingredients include Conserve and Esteem. Be sure to place bait around the mound and not on top of the mound for the most effective use.

Using baits in the surrounding lawn or grass area can also be helpful. With any chemical product, read the label and make sure it is approved for the use you need. Do NOT use a product in the vegetable garden unless it is labeled for use in the vegetable garden. See the UGA Pest Management Handbook for more information on chemical control. UGA’s Dan Suiter is the leader of the Urban Pest Management Program and they do research on fire ant control.

The bottom line – fire ants are not easy to control. It takes diligence and a combination of approaches. Contact your local UGA Extension Agent for the latest information on dealing with fire ants.

Happy Gardening!

CT Scanning Shows how Fire Ants Interlock to Form Floating Rafts

From Entomology Today

Fire Ants image by Novak and Hu and taken from Entomology Today article
Fire Ants image by Novak and Hu and taken from Entomology Today article

When water levels rise, red fire ants (Solenopsis invicta) stream from their nests and rapidly grip onto their nearest neighbors in order to form rafts to carry them to safety. Each individual ant is denser than water and is in danger of sinking. However, the ants somehow manage to stay afloat, and they don’t just draw the line at constructing rafts — they routinely form bivouacs, assemble towers, and even coalesce into droplets when swished in a cup.

“You can consider them as both a fluid and a solid,” said David Hu from the Georgia Institute of Technology, who teamed up with Paul Foster and Nathan Mlot to investigate how balls of living fire ants self-assemble.

Read the entire article at Entomology Today

Spring & fall are good times to control fire ants!

Original story by Sarah Lewis, student writer with the UGA College of Agricultural and Environmental Sciences

“April and September are good times to apply baits, once at the start of the season and toward the end to help control before they come back in the spring,” said Will Hudson, a professor with the UGA College of Agricultural and Environmental Sciences.

Fire ants are most active in warm weather. Fire ant season can last 10 to 11 months out of the year in the most southern areas of Georgia. Controlling ant colonies before they produce a mound is important. However, Hudson says that once a treatment program is in effect, timing is not all that important.

Baits and sprays

The general rule of thumb is if the area is one acre or less, don’t use baits. Re-infestation is more likely from colonies outside of the yard when baits are used.

One important thing to remember is the difference between ‘no mounds’ and ‘no ants.’ “There is a difference between eliminating ants and controlling them,” he said. “Baits do not eliminate ants because there is no residual control. A new colony can still come in and be unaffected by the bait laid down prior to their arrival.”

To eliminate mounds completely, apply baits every six months, Hudson said. “There will be invasion in the meantime, and you will still have fire ants, just not enough to create a new mound,” he said.

Hudson recommends treating lawns smaller than an acre with a registered insecticide in a liquid solution. This should rid the lawn of fire ants for one to three months. If you choose a granular product, measure carefully to be sure you apply the correct amount of material and get good, even coverage, he said.

The least effective treatment option for most people is individual mound treatments, according to Hudson. Treating mounds in general is going to be an exercise of frustration, and killing an entire colony by treating just the mound is a challenge, he said.

Minimal impact

Baits are considered to have minimal environmental effects for those who chose not to use hazardous chemicals. Once the bait is out, there is hardly anytime for anything to come in contact with it before the ants get to it.

Nonchemical options include using steam or boiling water. “We recommend using boiling water to treat a mound near an area such as a well where you do not want any chemicals,” Hudson said. “Using hot water is very effective, but the problem is you are not always able to boil the water right next to the area you want treated.” Carrying the boiling water can inflict serious burns, so extreme caution should be used when treating with this method.

There are products on the market that are approved by the Environmental Protection Agency and labeled as organic. Hudson says organic designation is a “slippery” definition. There is an official USDA certification and many states have their own set of regulations when labeling a product as organic. This labeling can mean the product is either a natural product or derived from a natural product. “While there are a few products that qualify as organic, with most baits the actual amount of pesticide applied is minimal,” he said.

Realistic expectations

Hudson says to be careful when choosing a product because the labels can be confusing, even deceptive, and it is difficult to make the right choice. For assistance in selecting a product, contact your local UGA Cooperative Extension agent.

“The most important thing to remember is that you need to be realistic in your expectations,” Hudson said. “If you are treating mounds, you need to be prepared. You are going to chase the mounds around the yard.”

For more information on selecting a control measure:

UGA Pest Management Handbook

Fire Ant Control Materials

Managing Imported Fire Ants in Urban Areas