Resistance to insecticides in the cotton bollworm, Helicoverpa armigera Hubner from cotton-growing regions of Andhra Pradesh, India

Abstract

Insecticides belonging to the four major groups were bioassayed against Helicoverpa armigera Hubner collected from cotton in the Guntur region of Andhra Pradesh, India, during the 1989/90,1990/91 and 1991/92 cropping seasons. High levels of resistance to all groups of insecticides were recorded. Tolerance to quinalphos had increased drastically in the 1991/92 season, while resistance to endosulfan, monocrotophos and carbaryl had increased moderately. The populations were also highly resistant to cypermethrin and deltamethrin and mildly resistant to fenvalerate. The resistance levels varied from season to season, thus reflecting the selection pressure created through insecticides.

Variation in Resistance to Pyrethroids in <I>Helicoverpa armigera</I> From Benin Republic, West Africa

“…Field treatments with pyrethroids to manage H. armigera have induced resistance to most of the active ingredients of this insecticide family in several cotton producing countries, such as Australia (Forrester et al 1993), Pakistan (Ahmad et al 1995, India (Sekhar et al 1995), China (Tan and McCaffery 1999), and Cô te dÕIvoire (Martin et al 2000). In Cô te dÕIvoire, resistance extends to all the pyrethroids tested, including deltamethrin, cypermethrin, and fenvalerate; the results obtained in Benin were not in contradiction with these Þndings.…”