An insect growth regulator (IGR) is a synthetic chemical that mimics insect hormones. Hormones regulate a wide array of body and growth (physiological) functions. Some examples include interfering with molting, interfering with pupal emergence, and interfering with body wall formation.
IGRs are often specific for an insect species or group of very closely related species. They often have delayed effects because they are taken into the insect and “stored” until the insect reaches the right growth stage. This may range from days to weeks or even months. For example, if the IGR stops the insect from molting, and a given insect is exposed just after a molt, it would continue to function normally until the next molt before dying.
In the case of termite control, the slow action of the IGR allows the chemical to be widely spread throughout the colony as the termite workers feed and groom each other.
The IGRs are, in general, environmentally safe and have very low mammalian toxicity. Some examples include noviflumuron, hexaflumuron, pyriproxyfen and methoprene.
Bait Technology and Application
There are several termite baits on the market that add to the arsenal of tools available for managing termite populations and protecting structures. Baits work on the principle that foraging termites will feed on a treated cellulose material, which eventually kills the termites and possibly the colony. The toxic material in the bait must kill slowly enough to allow foraging termites to return to the colony and spread the bait through food sharing (trophallaxis). Because dead termites repel other termites, the toxic material also must kill slowly enough so that dead termites do not accumulate near the bait.
Baits control a colony locally – either eliminating it or suppressing it to the point that it no longer damages a structure. To be successful, the products must be non-repellent, slow acting and readily consumed by termites.
There are three main types of bait products available:
1. Ingested toxicants or stomach poisons
2. Biotermiticides or microbes
3. Insect growth regulators (IGRs)
Each type has unique features and is used differently in termite control programs. Ingested toxicants have the quickest effect. However, dose dependency and learned avoidance may limit this type of product to termite reduction in localized areas.
Biotermiticide, which is derived from fungi, bacteria or nematodes, is injected into active gallery sites. It then develops on the infected foraging termites and spreads among the colony. Suitable temperature and moisture, early detection and avoidance are factors that determine this treatment’s success. It may provide localized area control or, with optimum conditions, may suppress a colony.
Among the insect growth regulators are juvenile hormone analogs (JHA), juvenile hormone mimics (JHM) and chitin synthesis inhibitors (CSI). These products disrupt the termites by causing a specific response or behavior within the colony or by blocking the molting process. Remember that all insects, including termites, have an exoskeleton made primarily of chitin. In order to grow, they must periodically shed their chitinous exoskeletons and form new ones. This process is called molting. A chitin synthesis inhibitor slowly builds up in the termite and, the next time a molt should occur, prevents proper formation of the cuticle. IGRs are the slowest of the bait types but have greater impact on the colony.
Some of the major baits available to the pest control industry are discussed below. Note their use for either colony elimination or for colony suppression.
Commercial Baiting Products
1. Sentricon System
Sentricon System, developed by Dow AgroSciences for professional use, combines monitoring with the use of permanent stations. Stations are installed in areas where termites exist and around the perimeter of a structure and in the yard. Each station contains a wood stake and must be periodically monitored for termite activity. After termites attack, the wood is removed and replaced with a bait tube. Termites from the wood must be transferred to the bait tube, which is left in the station until termite activity ceases. Then the bait tubes are replaced with new wood stakes and monitoring for new infestations resumes.
Thus, the Sentricon System protects property through an integrated program of monitoring, baiting when termites are present and resuming monitoring when termites are no longer present. The active ingredient in the Sentricon System is hexaflumuron, a chitin synthesis inhibitor. The philosophy behind the Sentricon System is that foraging pseudergates will feed on the bait, return to the colony and pass the bait to other colony members through trophallaxis. Dow AgroSciences claims that with the Sentricon System, colony elimination is possible.
2.Exterra Termite Interception and Baiting System
Ensystex Incorporated manufactures a termite baiting system called Exterra Termite Interception and Baiting System. The in-groundstations are designed to permit visual inspection without removing or disturbing the stations. The chitin synthesis inhibitor diflubenzuron (Labyrinth) is the active ingredient in the bait matrix, a shredded paper towel material.
3. Pestman Baiting System
Pestman Baiting System is an above-ground and underground termite monitoring and extermination product developed by Pestman. Pestman Hexaflumuron Termite Bait and In-ground & Above ground bait stations can be used together to achieve the best results for different termite problems.
Pestman hexaflumuron termite bait mixed with termite attractant and termiticide. Lured by the bait, termites feed on the Pestman termite bait and take it back to the colony. Then they will feed the bait to other termites. Eventually the entire colony termites will be eliminated. The main active ingredient hexaflumuron is a chitin synthesis inhibitor. A key component of a termite’s exoskeleton is the substance chitin. Without chitin termites cannot complete their natural moulting process. If they do not moult they die. Through our excellent technology,m the concentration of hexaflumuron has reached 10%, which is the highest concentration among similar products on the global market and 20 times that of other brands, which means that you can achieve the effect of killing entire colony by using less dosage.
Pestman applies an exclusive patented attractant in bait, which has a strong attraction to termites. Once termites start feeding on bait, they stop feeding on the timbers in building.
If you are interested, please contact us to get more information about the products.
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