THE INEFFECTIVENESS OF SEVIN IN INCREASING OVIPOSITION IN THE SPIDER MITE, TETRANYCHUS TELARIUS (L.)

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Abstract
Increased populations of tetranychid mites, following application of Sevin for the control of other pests, are common occurrences. These increases are often so great as to cause speculation that Sevin, besides destroying predators, has a direct stimulatory effect on reproduction in the mites. However, females of Tetranychus telarius (L.), exposed to Sevin, either in the young stages, or as adults, did not show significant increases in the rate of egg production. Nor did Sevin have any significant repellent effect on the mites. It is concluded that the increases noted in the field were caused solely by the elimination of predators.

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