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Seven insecticide treatments were evaluated to control the spring generation crawlers of the pine needle scale on heavily infested 6-8 ft Scotch pine Christmas trees. Each treatment was applied to 4 tree replicates. Foliar sprays were applied by using a Solo 425 backpack hand-pump sprayer. Each treatment consisted of 940 ml of each treatment/replicate. Treatments were applied 12 May under clear skies. The air temperature was 85°F, and RH was 70%. Six days posttreatment (18 May), a minimum of 5 infested needle fascicles were randomly removed from each tree. Fascicles were then individually placed in plastic bags and transported in an ice coolerl back to the laboratory, where the viability of the first 100 nymphs observed under a dissecting stereomicroscope was determined. Counts were always made! from a minimum of 5 fascicles.

Pine Needle Scale Control on Scotch Pine in Lancaster County, Pennsylvania, 1987