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  • 1 Tamil Nadu Agricultural University Department of Agricultural Entomology, Centre for Plant Protection Studies Coimbatore 641 003 India
  • 2 Indian Institute of Pulses Research Kanpur 208 024 Uttar Pradesh India
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Enzyme assays were carried out to study the influence of Nucleopolyhedrovirus (HearNPV) and Bacillus thuringiensis subsp. kurstaki (Btk) infection on the activity levels of pesticide detoxification enzymes, viz. carboxyl esterase (CE) and mixed function oxidase (MFO) in Helicoverpa armigera . HearNPV at LC 50 reduced the MFO activity by 12.0–13.5% and CE activity by 14.88–15.25% at 96 hours after treatment. Btk at LC 50 reduced the MFO activity by 4.17–4.27% and CE activity by 5.77–6.55%. The joint application of HearNPV and cypermethrin at LC 50 +LC 50 resulted in suppression of MFO activity by 15.08–17.35% and CE activity by 16.39–17.30%. Combined treatment of Btk and cypermethrin resulted in suppression of MFO by 4.24–6.72 and CE by 8.42–8.97%, respectively.

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