Effect of Nucleopolyhedrovirus and Bacillus thuringiensis infection on the activity of insecticide detoxification enzymes in cotton bollworm, Helicoverpa armigera Hbn.

Duraimurugan, P. and Regupathy, A. and Shanmugam, P. S. (2009) Effect of Nucleopolyhedrovirus and Bacillus thuringiensis infection on the activity of insecticide detoxification enzymes in cotton bollworm, Helicoverpa armigera Hbn. Acta Phytopathologica et Entomologica Hungarica, 44 (2). pp. 345-352. ISSN 0238-1249

Text aphyt.44.2009.2.11.pdf Restricted to Repository staff only until 31 December 2029. Download (364kB)

Abstract

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 LC50 reduced the MFO activity by 12.0–13.5% and CE activity by 14.88–15.25% at 96 hours after treatment. Btk at LC50 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 LC50 +LC50 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.

Actions (login required)

Edit Item