Abstract
Abstract A 4.4 acre 60-year-old commercial pear block was subdivided into 4 equal-sized plots to accommodate 3 different oil treatments and a check where no oil was applied. Volck Supreme was compared to 2 experimental spray oils which differed in terms of viscosity and emulsifiers. Oils were applied 28 Feb (dormant) together with flowable sulfur at 1 gal/acre; 14 Mar (delayed dormant) together with Ambush 2EC at 12 oz/acre and Lorsban 4E at 20 oz/acre; 29 May (1st cover) together with Guthion 50WP at 1.25 lb/acre. Otherwise, a standard insecticide and fungicide program was used throughout the test block. Sprays were applied dilute by an Aerofan sprayer delivering 200 gal/acre. Treatments were evaluated for PP control by beating tray counts of adults (25 trays/treatment) and nymph counts on spur (19 May) and shoot (24 Jun) leaves (108/treatment). Leaves were examined under a stereo microscope.
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