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Eleven treatments were applied to evaluate Cooley spruce gall adelgid on heavily infested 6-8 ft Douglasfir Christmas trees. Treatments were applied on 12 Apr and arranged in a randomized complete block design. Each treatment was replicated four times. Foliar treatments were completed by using a Solo Master 412 back pack mist blower operating at full throttle on setting two. Treatments were applied at the rate of 150 gal/acre (454 ml/tree). At treatment time the following conditions existed: air temperature, 50°F; RH, 19%; and skies were clear. Posttreatment counts were completed on 24 Jul. Each treatment was evaluated by selecting four cardinal locations on each tree within the lower 1/3, middle 1/3, and upper 1/3 of the tree canopy, and counting 25 needles at each location and recording the number of Cooley spruce gall damaged needles. A total of 100 needles were examined from within each canopy sampling area.

Spring Control of Cooley Spruce Gall Adelgid with Biorational and Conventional Insecticides on Douglasfir in Lehighton, Pennsylvania, 1991