Abstract
Abstract Treatments were applied to 30 year old “Bartlett” pear trees located at the Hanley Farm of Oregon State University’s Southern Oregon Experiment Station near Medford, OR. Plots consisted of 3, 6-tree replicates arranged in a random block design and sprayed to runoff with a Bean handgun sprayer at 250 psi. The spray timings utilized were delayed dormant (11-12 Mar) and pink bud (25-26 Mar) or pink bud and petal fall (26 Apr). NTN-33893 was applied only at the delayed dormant period. PP adult densities were estimated by counting individuals falling onto a cloth covered beating tray after tapping 3 limbs per replicate per treatment. Immature PP were estimated by counting nymphs on 15 fruit spurs (swollen bud) per replicate, 15 fruit clusters (open bud) per replicate or by brushing 15 fruit cluster leaves (small fruit stage) per replicate. Numbers and kinds of PP predators were also recorded from the beating tray samples.
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