Abstract

Abstract Thirty-yr-old pear trees were sprayed with handguns operating at 600 psi to evaluate candidate pesticides for control of insect and mite pests. Plots consisted of 5 single-tree replications in randomized block design. Treatments were evaluated for pear psylla by counts of adults and nymphs at 2-wk intervals. Adults were counted by taking 5 single-tree replications in randomized block design. Treatments were evaluated for pear psylla by counts of adults and nymphs at 2-wk intervals. Adults were counted by taking 5 beating-tray samples/rep. Nymphs were counted on 5 fruiting spurs on May 25 and on 5 growing terminal shoots thereafter/rep. All tissues on fruiting spurs were examined. Five leaves were examined from each shoot including the proximal and distal leaves and 3 evenly-spaced leaves between. Phytophagous mites were counted from 25-leaf samples/rep by the leaf brushing technique. Pear psylla russet and codling moth entries were counted on 100 fruits/rep at harvest. Harvest samples of 10 fruits/rep were weighed, tested for firmness with a penetrometer and for soluble solids with a refractometer.

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