Laboratory bioassays (a leaf dip method) on Helicoverpa armigera (Hübner), collected from 1991 through 1993 from the riverine belt of Pakistan, demonstrated that this insect pest has developed a moderate to high level of resistance to cypermethrin and monocrotophos compared with a susceptible laboratory strain. Resistance to endosulfan was moderate. We also found low level of resistance to chlorpyrifos, profenofos, and thiodicarb. We recommend a rotational strategy involvingthe pesticides having low resistance and different modes of action, along with other integrated pest management tactics, to manage insecticide resistance in H. armigera in Pakistan.
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Ahmad et al. (1995) studied this question.