Preventive Insecticide Resistance Strategy in Helicoverpa (Heliothis) armigera (Lepidoptera: Noctuidae) in Israeli Cotton

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Abstract
Since 1987 an insecticide resistance management (IRM) strategy has been implemented in cotton fields in Israel. To assess the efficacy of the IRM strategy, a long-term monitoring program in Helicoverpa armigera (Hübner) was undertaken to test the response of this pest to various insecticides. The monitoring technique was based on the exposure of pheromone trap-caught males to residues of four common compounds representing the major groups of insecticides. The diagnostic concentrations, established on LC80-90 of a susceptible H. armigera field population, were 0.57 µg endosulfan, 0.74 µg cypermethrin, 0.38 µg methomyl, and 2.0 µg methidathion per scintillation vials. Collections of H. armigera moths were done during the cotton growing seasons of 1987 through 1991. In general, the results indicate that the susceptibility of H. armigera to the test compounds was not appreciably altered from 1987 to 1991, although fluctuations during the season were observed. In most cases, the resistance levels to the test compounds fluctuated in a typical V-shaped curve during the season. The susceptibility of H. armigera to the various insecticides observed during the course of this study is consistent with the proposition that the IRM strategy can be correlated with successfull management of resistance in this pest.

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