Management of Pine Needle Midge on Scotch Pine with Biorational and Conventional Formulations in Indiana County, Pennsylvania, 1992

Eight treatments were applied to evaluate control of pine needle midge on heavily infested 6-8 ft Scotch pine Christmas trees. Treatments were completed on 10 Jun and 25 Jun, and replicated five times in a randomized complete block design. Foliar treatments were completed by using a C02 compressed air sprayer with one 8004VS Teejet nozzle mounted on a 24 inch boom operating at 28 psi. Treatments were applied at the rate of 124 gal/acre (375 ml/tree), and applications were confined to the terminal. The following conditions existed on 10 Jun: air temperature 80°F; water pH, 7.0; 52% RH; and skies were partly cloudy. The following conditions existed on 25 Jun: air temperature, 68°F; water pH, 7.0; 80% RH. At 52 DAT (1 Sep), each treatment was evaluated by determining the percentage of missing needles from each terminal.