Abstract

Abstract Experimental sprays were applied to replicated 3-tree plots of 8-year-old Bartlett trees. Each treatment was replicated 5 times. Trees were planted to a spacing of 7.4 x 7.4 m. Treatments were applied with a handgun from a truck-mounted hydraulic sprayer at 375 psi. Dates of application were: bud burst (3 Apr), white bud (19 Apr), and petal fall (6 May). Approximately 2 gal of spray was applied per tree. Treatments were evaluated for PP control by counts of eggs and nymphs at 1 to 2 week intervals. Counts were made by sampling 10 mid-terminal or spur leaves from the middle tree in each replicate. The count on 30 May was made by sampling 5 mid-terminal and 5 distal leaves from each tree. PP pressure was moderate through the experiment.

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