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Pilot project of Bacillus thuringiensis against western spruce budworm in central Montana, 1981

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  • Cooperative Forestry and Pest Management conducted a pilot control project in central Montana to determine the effectiveness of two com­mercial formulations of BaaiUus th,uringiensis Berliner applied at 8 billiori international units (BIU) per acre (19.8 BIU per hectare) when used under operational conditions against the western spruce budworm, Choristoneu:roa ocaidentalis Freeman. Nine blocks 2,000-4,200 acres (810-1,701 hectares) were selected in areas of budworm infestation on State, private, BLM, and Forest.Service lands near Butte, Montana . Three blocks were randomly assigned Dipel 4L treatment, three blocks were assigned Thuricide 16B treatment, and the remaining three served as control blocks.
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