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VOL. 11, ISSUE 1 (2026)
Evaluation of transgenic Bt cotton hybrids for field incidence, multiplication and ovipositional preference of cotton leafhopper, Amrasca biguttula biguttula (Ishida)
Authors
Harish Kumar, Ram Singh
Abstract
The study evaluated the field incidence, survival, development, and
ovipositional preference of the cotton leafhopper, Amrasca biguttula
biguttula (Ishida), on Bt (Cry1Ac), BG II (Cry1Ac + Cry2Ab), and non-Bt
cotton hybrids (BIO 6488 and RCH 134) grown at CCS HAU, Hisar. Although Bt
cotton was originally introduced in India in 2002 to control the American
bollworm, Helicoverpa armigera, concerns arose regarding its impact on
sucking pests like leafhopper. Field observations from 40 to 140 days after
sowing showed that leafhopper incidence was generally lower on BG II hybrids
during early stages, but differences among BG II, Bt, and non-Bt
hybrids were inconsistent and mostly non-significant, especially after peak
infestation (90 DAS). Laboratory and cage studies revealed no significant
differences in leafhopper survival (61.67–73.33%), though the nymphal
developmental period varied slightly, being shortest on RCH 134 Bt and
longest on BIO 6488 BG II. Ovipositional preference also did not differ
significantly, with eggs ranging from 19.83 to 21.17 per leaf across hybrids.
Overall, the results indicate that transgenic Bt cotton hybrids do not have a
consistent or significant impact on the survival, development, or oviposition
behavior of cotton leafhopper populations.
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Pages:422-424
How to cite this article:
Harish Kumar, Ram Singh "Evaluation of transgenic <i>Bt</i> cotton hybrids for field incidence, multiplication and ovipositional preference of cotton leafhopper, <i>Amrasca biguttula biguttula</i> (Ishida)". International Journal of Entomology Research, Vol 11, Issue 1, 2026, Pages 422-424
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