Excerpt from the report Summary: B.t. is the only biological or microbial safe insecticide available for spruce budworm control. Indeed, it is likely to be the only alternative to chemical pesticides in the foreseeable future. B.t. treatments sometimes fail to achieve acceptable results, just as chemical insecticides do, but given reasonable conditions of use, B.t. is usually successful in protecting foliage. At present, B.t. must be considered a viable alternative for chemicals in many situations, especially in environmentally sensitive areas where foliage protection is the goal.