Abstract
Abstract Fifteen insecticide treatments were evaluated to control the spring generation crawlers of the pine needle scale on heavily infested 5- to 6-ft Scotch pine Christmas trees. Each treatment was , applied to 4 tree replicates. Foliar sprays were applied by using a CO2 sprayer with one Spraying System 5500 adjustable cone nozzle mounted on the end of a 24-inch boom operating at 28 psi; 940 ml of each treatment was applied/replicate. Treatments were applied 16 May under sunny skies. The air temperature was 68°F, and RH was 50%. Nine days posttreatment (25 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 cooler back to the laboratory, where the viability of the first 100 nymphs observed under a dissecting stereomicroscope was determined. Counts were made for a minimum of 5 fascicles.
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