Predicting Emergence of Second-Instar Spruce Budworm Larvae from Hibernation under Field Conditions in Minnesota

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Abstract
Laboratory studies indicated that 2.5° C. approximated the threshold temperature that initiates diapause termination of the hibernating second-instar budworm larvae, Using this temperature as a base, it was possible to calculate from standard thermograph records the degree- hours that would establish the approximate date when first larval emergence can be expected in the field. The data given represent those conditions found in northern Minnesota. However, the method should be applicable to other regions.

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