Mechanisms of resistance in cotton to whitefly (<Emphasis Type="Italic">Bemisia tabaci</Emphasis>): antixenosis |
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Authors: | Vikas Jindal G S Dhaliwal |
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Institution: | (1) Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, India;(2) Present address: Department of Entomology, OARDC, The Ohio State University, Wooster, OH 44691, USA;(3) Insect Biopesticide Research Centre, Jalandhar, 144 003, India |
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Abstract: | Screenhouse experiments were conducted under free-choice conditions to determine the mechanism of resistance operating in
cotton against whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae). Twelve cotton genotypes belonging to Gossypium hirsutum and G. arboreum were assessed for oviposition preference by whitefly. The trichome density and length, distance from lower leaf surface to
nearest vascular bundles, leaf lamina thickness and compactness of vascular bundles were estimated for each genotype and correlations
with number of eggs laid were determined. The genotypes RS2098, CNH911, and PA183 were non-preferred for oviposition and exhibited
an antixenosis mechanism of resistance. NHH44, LK861, Supriya, RS2013 and LD694 were categorized as moderately resistant while
IS-376/4/1/20/72 and F846 were categorized as susceptible. Greater leaf lamina thickness and more compact vascular bundles
were correlated with egg laying by whitefly. |
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