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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Rapid degradation of Cry1F delta-endotoxin in soil

Rapid degradation of Cry1F delta-endotoxin in soil

Authors: Herman, R.A., Evans, S.L., Shanahan, D.M., Mihaliak, C.A., Bormett, G.A., Young, D.L., Buehrer, J.
Journal, Volume, Year: Environmental Entomology, volume 30(4):642-646, 2001
Summary

Dow AgroSciences tested a microbe- produced CryIF delta-endotoxin in up to 32-day degradation studies. The study was performed in a soil representative of the mid-south cotton-growing areas. The degradation was assayed using the tobacco budworm bioassay. Mortality at the highest CryIF concentration was <40% after 1 day in soil.

Comments

Indicates a short half life for Bt in one natural soil. Uses bioassay, but no "chemical" method. Does not use transformed plant protein, only microbially produced protein.