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Field trials conducted in 1990 and 1991 demonstrated that commercial formulations of Bacillus thuringiensis var. kurstaki Berliner applied late to fifth and sixth instar spruce budworm Choristoneura fumiferana (Clemens) expressly to avoid affecting the larval parasitoid Apanteles fumiferanae Viereck were as efficacious in controlling spruce budworm populations as a regularly timed spray that was targeted...