FITNESS COSTS OF Bt RESISTANCE IN Helicoverpa armigera (Hübner): IMPLICATION FOR REFUGEE STRATEGY IN Bt COTTON
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Date
2021
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DEPARTMENT OF AGRICULTURAL ENTOMOLOGY B. A. COLLEGE OF AGRICULTURE ANAND AGRICULTURAL UNIVERSITY ANAND
Abstract
The present investigations on fitness costs of Bt resistance in Helicoverpa
armigera (Hübner) in Bt cotton was carried out at the laboratory of AINPVPM:
Agricultural Ornithology, Anand Agricultural University, Anand, Gujarat during
2018-2020. The Bt cotton fields of the Karjan region of the Vadodara district of
Gujarat were visited frequently to collect the H. armigera larva. The survey was
conducted to collect the population of Bt resistance H. armigera larvae from 105
cotton fields at weekly intervals during the year 2019-2020. During the survey total of
71 Bt resistance, H. armigera larvae were collected along with different plant parts
(tender leaves, older leaves, squares, flowers, and bolls) on which they feeding and
the maximum population of H. armigera larvae were collected from bolls (60.56%)
and followed by tender leaves (16.90%), squares (14.08%), flowers (5.63%), and
older leaves (2.82%) and other insect fauna includes five species of Lepidoptera, four
species of Hemiptera and one species of Thysanoptera, Coleoptera and Orthoptera and
insects predators were also recorded, which includes two species of Coleoptera and
one species of Neuroptera, Hemiptera, Mantodea and Arenae (non-insect predator)
were also recorded.