Mechanisms of resistance in cotton to whitefly (<Emphasis Type="Italic">Bemisia tabaci</Emphasis>): Tolerance |
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Authors: | Vikas Jindal G S Dhaliwal A K Dhawan V K Dilawari |
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Institution: | (1) Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab, India;(2) Insect Biopesticide Research Centre, Jalandhar, 144 003, India |
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Abstract: | Screen house experiments were conducted under no choice conditions, to determine the tolerance, a mechanism of resistance,
in cotton under a population pressure of 150 and 300 pairs of whiteflies Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae). Twelve cotton genotypes, viz., four resistant (NHH 44, Supriya, LD694 and PA 183), four susceptible (F 846, IS-376/4/1/20/72, LK 861 and RS 2013) and four
with moderate reaction (T x Maroon 2-78, MRC 6304Bt, RS 2098 and CNH 911) to B. tabaci were assessed in terms of decrease in plant height, number of nodes and chlorophyll content (a, b and total) from control. The study revealed that all three characters are important to identify tolerance. A strong tolerance
mechanism is operating in NHH 44. The genotypes LD 694 and PA 183 were rated as moderately tolerant, however, IS 376/4/1/20/72,
Tx Maroon 2-78, MRC 6304Bt, F 846 and CNH 911 exhibited no tolerance mechanism and were categorized as the most susceptible
genotypes. |
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Keywords: | Gossypium spp Bemisia tabaci Plant resistance Tolerance Chlorophyll content Number of nodes Plant height |
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