Abstract
Effects of two formulations of thuringiensin (ABG-6266 and ABG-6162A) on mortality, fecundity, and feeding of the twospotted spider mite, Tetranychus urticae Koch, were evaluated. Toxicities of the formulations were not significantly different. No differences in toxicity to protonymphs and deutonymphs were observed, but immature instars were significantly more susceptible than adults. Low mortality of all instars was recorded after 3 d, indicating slow activity. The relationship between concentration of thuringiensin and reduction in fecundity and feeding of T. urticae adults was significant. Toxicity to immatures and the sublethal effects described suggest that thuringiensin may control field populations of T. urticae despite low initial mortality
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