Abstract
Abstract Fifteen insecticide treatments were evaluated for control of summer 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 to each replicate. Treatments were applied 17 Jul under partly cloudy skies. The air temperature was 78°F, and RH was 62%. Twelve days posttreatment (29 Jul), 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 from a minimum of 5 fascicles.
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