Abstract
Abstract 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.
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