Residual effects of the toxin from Bt serovar japonensis strain buibui in the soil
Authors: Suzuki, N., Hori, H., Tachibana, M., Indrasith, L.S., Fujie, A.
Journal, Volume, Year: Applied Entomology and Zoology, volume 29(4):610-613, 1994
Short communication about the residual activity of Bt japonensis in soil. Soil was collected from a vegetable field, mixed with crystal and spores, and incubated for 120 days. Soil samples were also collected from treated turf grass and sweet potato fields at intervals. Samples were tested in food incorporation assays with cupreous chafer larvae. The toxin retained over 50% of its activity for 30+ days for all situations.
Used crystal/spore toxin, not transgenic. The sweet potato study showed a decrease in activity to 60 days, but then an increase. Does show fairly long activity in soil.