Control of Pinon Spindle Gall Midge With Foliar-Applied Insecticides, 1995

Trials were conducted on established pinon pine, approximately 12 ft in height, located on the campus of Colorado State University in Ft. Collins. Plots consisted of individual branches, each averaging approximately 2 ft in length. Plot design was a RCB with 5 replications. Treatments were applied using a hand-operated pump mister on 3 Jul, covering foliage to the point of run-off. At the time of treatment, adult midge emergence was increasing and near peak. Plots were sampled on 8 Aug by removing 3 terminals per branch and counting the number of swollen and normal new needle pairs. A percent swollen needle bundle estimate was then calculated for each experimental unit.