Biochemical basis of resistance to whitefly Bemisia tabaci Geno. (Aleyrodidae: Hemiptera) in cotton

N.S. Butter, B.K. Vir, Gurdeep Kaur, T.H. Singh, R.K. Raheja

Abstract


To determine the relationship of biochemical constituents of leaves with whitefly Bemisia tabaci Genn., sixteen cotton cultivars were tested under screen-house conditions. The incidence of whitefly (adults/ nymphs/eggs) was recorded and correlations between the population densities and the content of biochemical constituents of cotton during the vegetative and reproductive stage were calculated. Total sugars, tannins, flavonols, phenols, o-dihydroxyphenols and gossypol were found negatively correlated with the population density of whitefly. The correlation coefficients between nymphal population and tannin content and between egg and tannin were -0.5179 (P = 0.05) and -0.7543 (P = 0.01), respectively. Cultivars having greater total phenolic and o-dihydroxyphenolic contents in leaves supported fewer whitefly eggs (r was -0.6670, P = 0.01 and -0.5863, P = 0.05), respectively.

Keywords


Resistance; Whitefly; Cotton

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