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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / No effect of Bacillus thuringiensis corn and Bacillus thuringiensis on the predator Orius insidiosus (Hemiptera: Anthocoridae)

No effect of Bacillus thuringiensis corn and Bacillus thuringiensis on the predator Orius insidiosus (Hemiptera: Anthocoridae)

Authors: Al-deeb, M.A., Wilde, G.E., Higgins, R.A.
Journal, Volume, Year: Environmental Entomology, volume 30(3):625-629, 2001
Summary

A commercial formulation of Dipel ES (Cry1Aa, Cry1Ab, Cry1Ac, Cry2Ac, and Cry2B) was incorporated into diet fed to european corn borer (Ostrinia nubilalis), which were subsequently fed to field-collected Orius. In one experiment the ECB were resistant to Bt, in the other they were susceptible. In another experiment, Orius were fed corn silks of 7590Bt. Mortality, growth, and development were observed. Orius were unable to survive on corn silks alone. In the diet incorporation studies, no significant differences were seen between Bt and Bt-free treatments. Field counts were also conducted in Bt and non-Bt fields, with no significant differences in Orius number observed.

Comments

Orius feeding on ECB do not appear to be at risk. Also looked at sublethal effects. Did not use plant-porduced form of protein, except in study with silks, but did use a formulation that had several different proteins.