Abstract
1. Titrimetric and colorimetric techniques were used to study esterases hydrolysing acetylcholine chloride and ethyl butyrate of an OP-susceptible and an OP-resistant strain of the green peach aphid, Myzus persicae Sulz. 2. ChE activity and sensitivity to eserine sulphate and dichlorvos were similar for both strains. However, ethyl-butyrate-splitting carboxylesterases (CarEs) were less active in the R-strain with a K m value of 8 × 10 −5 M for the against 9.7 × 10 −5 M for the S-strain. 3. Dichlorvos was more potent than TOCP as an inhibitor of CarEs and was equally effective against CarEs of both strains.
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