Abstract
Abstract Eleven-yr-old pear 'Bartlett' and 'Anjou' trees were sprayed with handguns operating at 600 psi to evaluate S 71639 for control of pear pests. Plots consisted of 2 replicates of 6 × 6 tree rectangles. Treatments were evaluated for PP and PRM control by counts made at 2-wk intervals. Adult PP were counted from a 25-beating-tray sample/replication. PP nymphs and PRM were counted from 2 50-leaf sample/ replicate. Leaf samples consisted of the proximal leaf, distal leaf and 3 leaves from the middle of 10 terminal shoots. Leaves were brushed and resulting slides were examined under magnification. PP russet and other pest damage were rated according to U.S. grade standards for fresh market pears on 100 mature fruits/cultivar/replication. Factors of fruit quality including firmness, soluble solids and size were evaluated from 2 10-fruit samples/replicate at normal harvest maturity. Fruit and foliage were examined for phytotoxicity after each spray. Pest control and fruit damage were compared to a standard spray program and a control plot in a different pear block located about 300 m from the S 71639 treated plots. The standard program consisted of the following sprays: 1) 15 May, Guthion 35 WP 12 oz; Agri-Mek 0.15 E 5 oz and superior type oil 1 qt/100 gal. 2) 5 Jun, Guthion 35 WP 12 oz/100 gal. 3) 9 Jul, Mitac 50 WP 12 oz/ 100 gal. 4) 19 Jul, Guthion 35 WP 12 oz plus Mitac 50 WP 12 oz/100 gal.
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