oa African Entomology - Vamidothion tolerance in a strain of the woolly apple aphid, Eriosoma lanigerum (Hausmann) (Hemiptera: Aphididae)
Two groups of apple trees were artificially infested with the woolly apple aphid, Eriosoma lanigerum (Hausmann). One group was infested with a strain sensitive to vamidothion while the second group was infested with a strain thought to be resistant to this insecticide. Both groups were sprayed with vamidothion. There were initially fewer colonies of E. lanigerum on the trees infested with the sensitive strain compared with those with the resistant strain. After spraying there was a significant reduction in the number of colonies on trees with the sensitive strain but not on those infested with the resistant strain. It therefore appears that strains of E. lanigerum are at least tolerant to vamidothion.
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