uals who are known to be allergic to fire ant stings should seek professional advice from a physician or allergist, especially if they are in situations where they might be exposed to these pests. There are emergency treatment kits that are available (by prescription) for individuals who are sensitive to their sting. Fortunately, relatively few deaths from fire ant stings have been documented, especially when compared to deaths from bee and wasp stings. Victims stung to death by fire ants often were not able to escape, sustained large numbers of stings, and suffered allergic reactions to the venom.
There are basically two methods of fire ant control, namely individual mound treatment and broadcast treatment. Before attempting either, it is advisable to check with regulatory agencies as the availability and use of different chemicals for either method may vary from state to state. In addition, in many cases free control by state governmental agencies of these pests is available.
Individual Mound Treatments. Treating individual fire ant mounds can be time consuming, but it is generally the most effective method of control. Once treated it will take anywhere from a few hours to a few weeks before total elimination of a colony depending on the product used, time of the year and size of the mound. Treatment is usually most effective in the spring with the key being to treat all the mounds in the area. If control is not complete, reinfestation of an area can take place in less than a year. There are several different methods that can be used to treat individual mounds.
Insecticides-One of the more commonly used methods is drenching mounds with a high volume of diluted contact pesticide. As with any treatment, it is extremely important to follow label directions not only to attain maximum effect, but to maximize safety of the application and avoid potential illegal consequences. In most cases the mounds and surrounding areas are wetted thoroughly but gently with the drench. Subsequently the mound is broken open and the insecticide is poured directly into the tunnels. Mound drenches are most effective after rains when the ground is wet and the ants have moved up into the drier soil in the mound. During excessively dry weather, effectiveness of the treatment may be enhanced by soaking the soil around the mound with water before treatment. One problem with this technique is that the queen may be too deep to be reached with the drench. This may be especially true if the colony is disturbed prior to an application. In this case the workers may move the queen deeper into the colony in order to avoid a potential threat.
Granular formulations are also available for individual mound treatment. In this case once the recommend dose is applied to the mound it should be watered thoroughly in order to reach the worker ants and queen that occur deeper in the colony. The dissolved granules must come into direct contact with the ants to have any effect. As in mound drenches, care must be taken not to disturb the colony prior to application.
A few insecticides are marketed as injectants. In
this case they may be injected using a "termite rig" with a
soil injector tip, a standard 1-3 gallon compressed air sprayer with a fire
ant injector tip, or a special aerosol soil injector system. The mound is injected
in a circular pattern, usually at 3 to 10 points. A new product combines
insecticide treatment with high temperature vapors to increase
Fumigants are readily available in most states for fire ant control. These are usually more effective than surface applications or mound drenches but are also more expensive and can be dangerous if not handled properly.
Depending on the state a number of fire ant baits are available. These can be used for treating individual mounds or for broadcast treatment of larger areas. The bait should be uniformly applied around the mound 0.3 to 1.0 meters away and not on the mound itself. Baits are much slower acting than the control methods listed above but are generally safer, cheaper and more effective in the long run