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Epilithic microbial communities were colonized on leaf disks and exposed to commercial preparations ofBacillus thuringiensisvar.kurstaki(Btk) in aquatic microcosms. Responses in terms of microbial respiration, bacterial cell density, protozoan density, and microbial decomposition activity were measured. Test concentrations for treatments with Dipel 64AF and Dipel 8AF in microcosms were the expected...