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White Pine Weevil Control in Howard, Pa, 1983


 White pine trees (2-2.5-m tall) were selected on 17 May near Howard, PA in Centre Co. if they contained 1-3 active weevils on the leaders. Seven treatments (replicated 4 times in a RCB design) were applied on 19 May using a 1.5-gal stainless steel hand-pump compression sprayer. The leaders and first whorl of branches were wet until runoff. Post-spray counts of adult weevils were made 3 days after treatment. Larval success was evaluated by cutting off damaged leaders, stripping off the bark and counting large larvae, pupae or pupal chambers.