Pyrethroid Resistance and Mechanisms of Resistance in Field Strains of Helicoverpa armigera (Lepidoptera: Noctuidae)

Kranthi, K. R. and Jadhav, D R and Wanjari, R. and Kranthi, S. and Russell, D. (2001) Pyrethroid Resistance and Mechanisms of Resistance in Field Strains of Helicoverpa armigera (Lepidoptera: Noctuidae). Journal of Economic Entomology, 94 (1). pp. 253-263. ISSN 0022-0493

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Pyrethroid resistance was found in 54 field strains of Helicoverpa armigera collected between 1995 and 1999 from 23 districts in seven states of India. LD50 values of the field strains ranged from 0.06 to 72.2 μg/larva with slopes of 0.5-3.1. Resistance was highest in regions where pyrethroid use was frequent (four to eight applications per season). Resistance to deltamethrin was exceptionally high with resistance ratios of 13,570 and 27,160 in two strains collected during February 1998 in central India. Resistance to cypermethrin, fenvalerate and cyhalothrin also was high with resistance ratios of >1,000 in four strains collected from central and southern India. Resistance ratios were below 100 in >50% of the strains tested. Pyrethroid resistance was high in strains collected from the districts in Andhra Pradesh where a majority of the cotton farmer suicide cases in India were reported. Resistance to pyrethroids appeared to have increased over 1995-1998 in most of the areas surveyed. Studies carried out through estimation of detoxification enzyme activity and synergists indicated that enhanced cytochrome p450 and esterase activities were probably important mechanisms for pyrethroid resistance in field strains. Pyrethroid nerve insensitivity also was found to be a major mechanism in some parts of the country where the use of pyrethroids was high. The information presented illustrates the importance of proper insect management programs to avoid the consequences associated with improper insecticide use.

Item Type: Article
Uncontrolled Keywords: Helicoverpa armigera; pyrethroid resistance; India; cytochrome p450; esterases; nerve insensitivity
Subjects: Mandate crops > Chickpea
Mandate crops > Pigeonpea
Others > Entomology
Depositing User: Mr Siva Shankar
Date Deposited: 12 Dec 2011 11:06
Last Modified: 12 Dec 2011 11:06
Official URL:
Funders: Natural Resources Institute(UK), Department for International Development(UK)
Acknowledgement: Financial support was provided by the Natural Resources Institute, UK, through an Adaptive Research Initiative of the UK Government's Department for International Funding (DFID, UK) as NRl/ICRISAT/ICAR Project.
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