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Fourteen treatments were applied to evaluate Cooley spruce gall adelgid on heavily infested 5-6-ft Colorado blue spruce Christmas trees. Each treatment was applied on 6 Apr to 4-tree replicates. Foliar treatments were completed by using a Solo Master 412 mistblower. Treatments were applied at 2 rates as follows: 74.3 gal/acre (225 ml/tree) and 148.6 gal/acre (450 ml/tree). At treatment time the following conditions existed; air temperature, 65°F; 68% RH; water pH 5.0; skies were clear and sunny. Posttreatment counts were made 21 Sep. Each replicate was evaluated by counting and recording the number of new (1988) galls formed on each replicate.

Spring Control of Cooley Spruce Gall Adelgid on Colorado Blue Spruce in Berks County, 1988