Abstract
An active microsomal oxidase system was found in various tissues of the mole cricket adults, Scapteriscus acletus Rehn and Hebard and Scapteriscus vicinus Scudder. Aldrin epoxidase activity was mainly located in the midgut and Malpighian tubules. p-Nitroanisole O-demethylase and p-chloro- N-methylaniline N-demethylase activities were also detected in these two tissues. The overall oxidase activities in the two species were generally similar. Seasonal variation in epoxidase activity was evident in the two species with the spring populations having more activity than the fall populations. Spectral characterization of the cytochrome P-450 revealed that the enzyme was not of “resistant type” in both species. S. vicinus was four- to fivefold more susceptible to the insecticide propoxur than S. acletus.
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