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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Relative toxicity of Bacillus thuringiensis var. tenebrionis to the two-spotted spider mite (Tetranychus urticae Koch) and its predator Metaseiulus occidentalis (Nesbitt) (Acari, Tetranychidae and Phytoseiidae)

Relative toxicity of Bacillus thuringiensis var. tenebrionis to the two-spotted spider mite (Tetranychus urticae Koch) and its predator Metaseiulus occidentalis (Nesbitt) (Acari, Tetranychidae and Phytoseiidae)

Authors: Chapman, M.H., Hoy, M.J.
Journal, Volume, Year: Journal of Applied Entomology, volume 111:147-154, 1991
Summary

Wettable powders from Btt were tested at field application levels for their toxicity to two-spotted spider mites and its predator mite. There was relatively little effect on survival of the spider mite but there was only 26% survival of the predator.

Comments

They did not use transgenic Bt. This study did show toxicity to a beneficial predator.