Abstract

Abstract Experimental sprays were applied to runoff to single-tree plots in a randomized block design with 2 replicates of Golden Delicious and 2 Red Delicious, both spur-type trees. Experimental sprays were applied with a spraygun from a truck-mounted John Bean sprayer equipped with a 35 gpm pump. Spray dates were as follows: UC-55248 on Apr 25, Jun 7, Jul 16 and 25; SLJ-0312 on May 14, Jun II and Jul 9; calcium chloride only treatments on May 28, Jul I and Aug 19; all other treatments on Jun 7 and 17, Jul 16 and 25 (Plictran was added to the 1st calcium chloride treatment on these dates). General purpose sprays of 3 lbs. captan 50W, 0.5 lb. Guthion 50W and 3 lbs. Sevin 50W/50 gals of water/acre were applied at ca. intervals of 2 weeks throughout the summer. Average temperatures were: May 61.5°F; Jun 66.5°F; Jul 74.9°F; and Aug 76.3°F. Rainfall in inches averaged: May 4.49; Jun 4.02; Jul 1.48; and Aug 1.71. Effectiveness of the test materials on the European red mite was evaluated by making several counts of mites on random samples of 25 leaves/tree, 100 leaves/treatment. Mite population pressure was heavy throughout the season. Russeting of Golden Delicious apples was determined by scoring a random sample of 30 apples/replicate, 60 apples/treatment. Fruits were rated as no russeting (I), light russeting (2), moderate russeting (3), and severe russeting (4). Possible ranges were: russeting, none to light 30-60, light to moderate 60-90, and moderate to severe 90-120.

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