Abstract
Houseflies were pretreated with olive oil by two methods, topical application or injection, then exposed to residues of DDT, dieldrin, methyl parathion, or dimethoate. Knockdown was recorded for normal and pretreated flies. Knockdown rates of pretreated flies were significantly different (generally lower) from normal flies in practically all cases. Protection against knockdown was positively correlated with olive oil-water partition coefficients of the insecticides. The effect of dosage on the degree of protection was investigated with DDT. These data support the possibility that hemolymph distributes insecticides throughout the body in exposed insects.
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