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Areawide Field Study on Effect of Three Chitin Synthesis Inhibitor Baits on Populations of Coptotermes formosanus and Reticulitermes flavipes (Isoptera: Rhinotermitidae)

Osbrink, Weste L.A., Cornelius, Mary L., Lax, Alan R.
Journal of economic entomology 2011 v.104 no.3 pp. 1009-1017
Coptotermes formosanus, Reticulitermes flavipes, baits, diflubenzuron, hexaflumuron, chlorfluazuron, termite control
Periodic sampling of 43 independent monitors, initially active with Formosan subterranean termite, Coptotermes formosanus Shiraki, or the eastern subterranean termite, Reticulitermes flavipes (Kollar) (Isoptera: Rhinotermitidae), was conducted to evaluate the effects of cellulose baits containing one of three chitin synthesis inhibitors (CSIs)--diflubenzuron, hexaflumuron, or chlorfluazuron--on termite populations. Diflubenzuron at 0.1% active ingredient (AI, wt:wt) had no noticeable effect on termite populations. Chlorfluazuron (0.25% [AI]) significantly reduced termite populations in ≈3 yr. Chlorfluazuron used after >2-yr diflubenzuron treatment significantly reduced termite populations within months. This suggests diflubenzuron exposure increased the termite's sensitivity to chlorfluazuron accelerating population collapse. Hexaflumuron (0.5% [AI] ) also reduced termite populations in approximately equal to 2 yr. The process of removing most detectable termite populations from the approximately equal to 460,000-m2 campus of the Southern Regional Research Center, New Orleans, LA, with CSIs baits required approximately equal to 3 yr. Adjustments in the specific bait formulations and application procedures might reduce time to suppression. Establishment of new independent termite populations provides a mechanism to minimize the effects of baits. Remedial control measures around and under structures should be considered when implementing an area wide management strategy.