Abstract
Tedion® (2,4,4',5-tetrachlorodiphenyl sulfone) had little or no contact effect on eggs of different ages from two-spotted spider mites, Tetranychus telarius (L.). However, a high percentage of hatching larvae were killed. Tedion-treated females produced a high percentage of nonviable eggs the first 24 hours with a marked decrease thereafter. The number of nonviable eggs produced by untreated females after feeding on Tedion residues increased with the length of feeding time. A strain of spider mites previously exposed to Tedion under greenhouse conditions was resistant to these effects.
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