The Toxicity of Some Substituted Phenyl Benzenesulfonates to the Two-Spotted Spider Mite and Mexican Bean Beetle

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Abstract
Twenty-two compounds were tested against the egg and adult life stages of the mite and the larvae of the beetle. Optimum mite ovicidal activity occurred where both rings were substituted with Cl in the para position (4-chlorophenyl ester of 4-chlorobenzenesulfonic acid). This activity decreased when one chlorine was removed or replaced with bromine and decreased even more when both chlorines were removed or replaced with bromine at the concns. tested. Compounds containing other substitutions in this series were relatively ineffective. The compounds were not sufficiently toxic to adult mites to make possible an insecticidal-chemical structure correlation study. Toxicity to the beetle larva followed the same relationship of structure to activity as is shown against the mite egg. Toxicity was also obtained with the 4-methoxy phenyl ester of 4-chlorobenzenesulfonic acid.

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