Abstract
Abstract Test materials were applied to 16 yr old apple trees at Monmouth, ME, as dilute sprays with a hand gun from a hydraulic sprayer operating at 200 psi and at a rate of 300-350 gal/acre. Spray dates were May 5 (tight cluster), 9 (pre-pink), 29 (petal all), Jun 8 (first cover), 26-30 (second), Jul 8-9 (third), 22 (fourth), Aug 6 (fifth), and 18 (sixth); materials applied as indicated in table. The standard pesticide program (rates are per 100 gal) during the course of this test consisted of captan 80W (1 lb) on 7 dates, manzate 200 80W (.75 lb) plus Benlate 50W (3 oz) plus Imidan 50W (1 lb) on May 26 and Jun 4, Imidan 50W (1 lb) on May 29, Epsom salts (15 lb) on Jun 19, and Sevin 50W (2 lb) on Jul 6. There were no tank-mixtures of acaricides with other pesticides. There were 4 single-tree replications/treatment. A randomized complete block design was utilized with 4 ‘Red Delicious’ cultivars/treatment in Test 1, and 2 ‘Cortland’ and 2 ‘Golden Delicious’ in Test 2. From each tree 25 leaves were collected mostly at chest-height around the periphery of the tree, brought into the laboratory, the mites brushed onto glass plates coated with a Tween 20-alcohol mixture; mites were counted the same day.
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