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Evaluation of Pyrethroid Sprays for Control of Pinyon Spindle Gall Midge, Ft. Collins, 1988


 Experiments were conducted in an established landscape planting of pinyon pine on the campus of Colorado State University. Plots were single trees, arranged in a randomized complete block design with 4 replications. Sprays were applied 23 Jun with a hand-operated, compressed-air sprayer to run-off. At the time of application, adult spindle gall midge emergence was about 20% complete. Two evaluations were made. The first, 1 Aug, involved a 3-min survey of the tree. A second 2-min survey was made 1 Sep, after gall growth had become pronounced.