Apple, Insect Control, Hudson Valley, 1975

Experimental insecticides were evaluated for control of several pest species in an eleven-year-old planting on semidwarf rootstocks. Eight tree plots containing from five to seven different apple cultivars were arranged in a randomized complete block design with three replicates. Treatments were applied by handgun at 450 psi on May 9 (pink), May 22 and 23 (petal fall), June 10, and 23, July 8, and 22, and August 11. Fungicides were applied by airblast sprayer over the entire block for disease control and included Difolatan 4F,5 qt/100 gal on April 17, and Captan 80W 10 oz/100 gal on May 23 and June 9. The Mcintosh and Cortland cultivars were thinned with 10 ppm NAA on June 3. Temperatures during the season were above normal for the month of May, re suiting in a very short bloom period. Rainfall was above normal for the months of July (9.83 inches) and September (6.68 inches). Early leafroller injury resulted from redbanded leafroller, obliquebanded leafroller, and fruittree leafroller larval feeding. Late leafroller injury resulted from variegated leafroller and second generation redbanded leafroller larval feeding. Internal lepidopterous feeders included two broods of oriental fruit moth and codling moth, and a late season brood of lesser appleworm.