Apple, Mite Control, Hudson Valley, Highland, New York, 1980

Abstract

Abstract Eight-tree plots of from 5-7 different apple cultivars were replicated 3 times in a randomized complete block design. Insecticide treatments were applied at pink (Mcintosh), May I, petal fall (Rome), May 19, and In 6 cover sprays, Jun 5, 19, Jul 3, 17, 31, and Aug 14. The CGA 29170 treatment was applied only at pink, while the UC 55248 treatment was applied at pink and petal fall. Plictran 50W (4 oz form./lOO gal) was included with the DISA, HAG, Pydrin and Guthion treatments for mite control on Jul 3. All treatments were applied dilute to runoff using a handgun sprayer at 400 psi delivering 3.2 (during May) and 4.2 (Jun through remainder of season) gal spray/tree (307-403 gal/acre). Fungicides applied over the plots by airblast sprayer a 3X (133 gal/acre) included Difolatan 4F (5 qt/100 gal) on Apr 17 and Cyprex 65WP (4 oz/100 gal) on Jun 13. Above normal temperatures and below normal rainfall contributed to rather early and severe European red mite buildup. The “open” winter (no snow cover) apparently reduced Amblyseiusfallacis populations which remained low during the entire season.