Phosalone was tested to estimate the optimal time and minimum application rate for 90% population mortality of western spruce budworm, Choristoneura occidentalis Freeman, larvae. The optimal time of application was estimated to be during the first 10 days after the first group of second instars emerged from diapause, especially between days 7 and 8. Aerial application rates necessary to bracket 90% mortality were estimated as 320, 640, and 960 g/ha. Because these rates are well below the application rates used for agricultural pests, phosalone is a candidate for field trials on western spruce budworm.

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