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VOL. 11, ISSUE 1 (2026)
Seasonal variation in expression of Cry1Ac and Cry2Ab gene regulated endotoxins in transgenic cotton hybrids against neonates of Helicoverpa armigera (Hubner)
Authors
Harish Kumar, Ram Singh
Abstract
Three variants (non-BT, BT, and BG II) of the two cotton hybrids (RCH
134 and BIO 6488) were evaluated for insecticidal efficacy against Helicoverpa
armigera (Hubner) at CCS Haryana Agricultural University, Hisar. BG II
consistently exhibited superior efficacy against first instar larvae of H.
armigera compared to single-gene BT and non-BT hybrids. Toxin expression
was highest in leaves, followed by squares and bolls, at all crop stages.
However, overall insecticidal efficacy declined with advancing crop age, being
highest at 80 DAS (days after sowing), intermediate at 120 DAS, and lowest at
140 DAS. Differences between squares and bolls at similar crop ages were
generally non-significant. The study confirms that dual-gene (BG II) cotton
hybrids provide more stable and sustained protection against H. armigera,
although efficacy decreases as the crop matures.
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Pages:419-421
How to cite this article:
Harish Kumar, Ram Singh "Seasonal variation in expression of Cry1Ac and Cry2Ab gene regulated endotoxins in transgenic cotton hybrids against neonates of <i>Helicoverpa armigera</i> (Hubner)". International Journal of Entomology Research, Vol 11, Issue 1, 2026, Pages 419-421
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