Esterase activity in whiteflies (Bemisia tabaci) in Israel in relation to insecticide resistance
Wool, D. | Greenberg, S.
A cotton-field population of the whitefly Bemisia tabaci (Genn.) was 3-5 times more resistant to an organophosphorous insecticide than two control populations. Esterase activity levels in individuals from the resistant population were considerable lower than in control individuals. The distribution of activity values of large numbers of adults from the cotton field was strongly skewed to the right, while the control populations had symmetrical distributions. This may reflect selection against individuals with high EST activity. Control populations are almost fixed for a fast esterase allozyme, which preferentially cleaves β-Naphthyl Acetate. In field populations the alternative slow allozyme, which prefers the α-form of the substrate, is dominant. Low EST activity may be used as a marker for resistant individuals in Israeli B. tabaci.
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