Pyrethroid resistance and mechanisms of resistance in field strains of Helicoverpa armigera (Lepidoptera: Noctuidae).

@article{Kranthi2001PyrethroidRA,
  title={Pyrethroid resistance and mechanisms of resistance in field strains of Helicoverpa armigera (Lepidoptera: Noctuidae).},
  author={Keshav R Kranthi and Deepak R. Jadhav and Ravindra Wanjari and Sandhya Kranthi and Derek Allan Russell},
  journal={Journal of economic entomology},
  year={2001},
  volume={94 1},
  pages={253-63}
}
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 microg/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… CONTINUE READING

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