Abstract
AbstractSpruce budworm infested stands of white spruce and balsam fir were aerially sprayed with an entomopox virus, a nuclear polyhedrosis virus (NPV), a low dose of fenitrothion, and the two virus–chemical insecticide combinations. Long-term assessment of the efficacy of the treatments showed that NPV + a low dose of fenitrothion suppressed the budworm population density particularly on balsam fir below that causing economic damage for 3 years due mainly to transmission of the virus from one generation to the next and maintenance of natural control agents in the population.
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