Indian Journal of Agricultural Research, volume 48 issue 3 (june 2014) : 177-184

SURVIVAL AND DEVELOPMENT OF AMERICAN BOLLWORM (HELICOVERPA ARMIGERA HUBNER) ON TRANSGENIC BT COTTON

M.S. MahaLakshmi*, N.V.V.S.D. Prasad

Affiliations

¹Regional Agricultural Research Station, Lam, Guntur -522 034, India

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doi 10.5958/j.0976-058X.48.3.030

Cite article:- MahaLakshmi* M.S., Prasad N.V.V.S.D. (2025). SURVIVAL AND DEVELOPMENT OF AMERICAN BOLLWORM (HELICOVERPA ARMIGERA HUBNER) ON TRANSGENIC BT COTTON. Indian Journal of Agricultural Research. 48(3): 177-184. doi: 10.5958/j.0976-058X.48.3.030.

ABSTRACT

A laboratory bioassay was conducted to study the impact of Cry 1 Ac protein on survival and development of Helicoverpa armigera (Hubner.) by feeding larvae with Bt cotton plant parts. During the study, terminal leaves and squares of two Bt hybrids, their corresponding non Bt hybrids and Bunny as check were fed to larvae. Among the plant parts tested, mortality of H.armigera larvae was higher on leaves compared to squares of both the Bt hybrids. Further, the mortality of early larval instars was higher compared to older instar larvae on both leaves and squares of Bt hybrids. Though, the later instar larvae were able to survive when exposed continuously to Bt cotton plant parts, but reduction larval and pupal weight, increase in larval developmental period, malformations in pupae and adults, reduction in adult emergence, less fecundity, low growth and survival indices was observed on both the Bt hybrids compared to their corresponding non Bt hybrids and check hybrid, Bunny.

KEYWORDS

REFERENCES

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SURVIVAL AND DEVELOPMENT OF AMERICAN BOLLWORM (HELICOVERPA ARMIGERA HUBNER) ON TRANSGENIC BT COTTON

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