Abstract
Abstract Test materials were applied to apple trees at Monmouth, Maine, as dilute sprays with a hand gun from a hydraulic sprayer operating at 300 psi. In Tests 1 and 2, 10-year-old trees were sprayed at rates of 300 and 500 gallons per acre, respectively; in Test 3, 25-year-old trees were treated at 200 gallons per acre. Spray dates were May 9 (half-inch green). May 20 (pink), May 30 (petal fall), and June 10-11 (first cover). The standard pesticide program consisted of captan 80W (1.0-1.5 lb/100 gal) on 11 dates, Epsom salts (15 lb) on May 30, Solubor (1 lb) on June 10, Marlate 50W (3 lb) on May 30, June 10, and 23, and lead arsenate (2 lb) on July 3. There were no tank-mixtures of acaricides with other pesticides. There were 4 single-tree replications per treatment. A randomized complete block design was utilized with 1 Cortland (C) and 3 Red Delicious (RD) cultivars per treatment in Test 1; 1 Golden Delicious (GD), 1 Early Mcintosh, 1 RD, and 1 C per treatment in Test 2; and 1 RD and 3 GD per treatment in Test 3. From each tree, 25 leaves were collected mostly at chest height around the periphery of the tree, brought into the laboratory, and brushed onto glass plates coated with a Tween 20-alcohol mixture; mites were counted the same day. Mite population pressure was very severe. May and June were hot and dry except for unusually rainy weather the first 2 weeks of June.
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