| responses of songbirds to aerial spraying of the microbial insecticide bacillus thuringiensis var. kurstaki (foray 48b) on vancouver island, british columbia, canada. | use of bacterial insecticides containing bacillus thuringiensis var. kurstaki (btk) is gaining popularity as an environmentally safe control measure against lepidopteran pests, but indirect effects on nontarget organisms through reduced prey base have received little attention. aerial spraying of btk (foray 48b) over a 12,803-ha area on southeastern vancouver island (bc, canada) in may to june 1999 as part of a gypsy moth (lymantria dispar) control program provided us with an opportunity to exam ... | 2002 | 12152767 |