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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Bacillus thuringiensis var kurstaki affects a beneficial insect, the cinnabar moth (Lepidoptera: Arctiidae)

Bacillus thuringiensis var kurstaki affects a beneficial insect, the cinnabar moth (Lepidoptera: Arctiidae)

Authors: James, R.R., Miller, J.C., Lighthart, B.
Journal, Volume, Year: Journal of Economic Entomology, volume 86(2):334-339, 1993
Summary

Study of the effect of microbial formulations of Bacillus thuringiensis var. kurstaki on the cinnabar moth (a beneficial used for biological control of the noxious weed tansy ragwort). Foliage dipped in Bt solutions did not significantly affect survival of first, second, or third instars, but fourth and fifth instars were susceptible. LC50s were 0.31 and 0.22 mg/mL. Field tests were performed using potted ragwort plants at five application rates. Application rate significantly affected percentage of leaves defoliated and number of moths per plant.

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