Apple, Insect Control, Hudson Valley, 1977

Apple, Insect Control, Hudson Valley, 1977: Insecticide treatments were evaluated in a seasonal control program conducted in a thirteen-year-old planting on the EM 2 rootstock. Eight-tree plots containing from 5 to 7 different apple cultivars were replicated 3 times in a randomized complete block design. Treatments were applied dilute to runoff using ca 3.8 gal spray/tree (370 gal/acre) with a handgun sprayer at 425 psi. Treatments were applied at pink (Mcintosh) April 19, petal fall May 13, and in 6 cover sprays -- May 25, June-13, June 27, July 14, July 28, and Aug 11. The Ambush, Croneton + Guthion, Dipel, and Penncap treatments were applied June 9, but 2.2 in. of rain fell shortly after application and prior to drying, so they were reapplied with the rest of the treatments on June 13. Additional sprays applied over the entire block for disease control included: Difolatan 4F 5 qt/100 gal, Apr 1 (Handgun application), and Cyprex 65W 8 oz/100 gal on May 3, May 16, June 6, and June 21 (airblast application, 3X, 133 gal/acre). The ‘Rome Beauty’ and ‘Cortland’ cultivars were thinned with 8 ppm NAA, while the ‘Golden Delicious’ were thinned with 16 ppm NAA on May 18. A miticide (Plictran 50W 4 oz/100 gal) was applied along with the following treatments on July 14: Ambush 25W, Dipel W, Penncap 2F, SD 43775 2.4EC 1.3 oz, and Sumithion 40W. Above normal temperatures during April resulted in an early bloom and consequent early harvest. Rainfall was below normal for May and June but above normal for September.