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Mechanisms of resistance in cotton to whitefly Bemisia tabaci (Homoptera: Aleyrodidae): antibiosis

  • Vikas JindalEmail author
  • G. S. Dhaliwal
  • A. K. Dhawan
Article

Abstract

The antibiotic effects of 12 different cotton genotypes on Bemisia tabaci (Gennadius) were studied during June-July and August-September 2003, with the objective to determine the biological parameters which are important to study the mechanism of antibiosis and to identify the genotypes in which antibiosis is operating. The detailed biology of whitefly, i.e. developmental period, survival, fecundity, longevity and sex ratio were studied under “no choice” conditions, by confining the whiteflies in leaf cages. The study revealed that incubation period, nymphal developmental time, total developmental time, nymphal survival, total survival, fecundity and female longevity are the most important biological parameters for detecting the presence of antibiosis in resistant cotton genotypes against whiteflies. On the other hand, pupal period and survival, male longevity and sex ratio do not seem to play important roles in antibiosis. The combined effect of these parameters indicated that Gossypium arboreum genotype PA 183 was the most resistant while Bt 6304, TX Maroon 2–78 and F846 were the most susceptible ones. Other genotypes with moderate resistance include Supriya and LD 694.

Key words

Bemisia tabaci antibiosis plant resistance cotton biological parameters 

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© ICIPE 2008

Authors and Affiliations

  1. 1.Punjab Agricultural UniversityRegional StationFaridkotIndia
  2. 2.Insect Biopesticide Research CentreJalandharIndia
  3. 3.Department of EntomologyPunjab Agricultural UniversityLudhianaIndia

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