Apple, Treatment Combinations for Season Long Broad Spectrum Insect Control, 1994

Insecticides were applied to mature trees in Fennville, MI (Orange Block) at a rate of 125 gpa with an FMC 1029 airblast sprayer. Treatments were arranged in a completely randomized design of single trees replicated four times. Applications of materials were made on 9 May (Pink), 25 May (PF), 6 Jun (1C), 22 Jun (2C), 4 Jul (3C), 17 Jul (4C), 29 Jul (5C), 12 Aug (6C), 24 Aug (7C) and 5 Sep (8C) as indicated in the table. Captan, Dithane, Nova and Penncozeb were applied separately to all treatments. Mid-season fruit evaluations were made on 27 Jun by randomly picking 25 apples per replicate (100 apples per treatment) and evaluating the fruit for damage from insect pests. Harvest fruit evaluations were made on 15 Sep by randomly picking 50 apples per rep (200 apples per treatment) and evaluating the fruit for damage from insect pests. Leafhopper evaluations were made on 2 Jun, 8 Jul, 19 Jul, 12 Aug, 19 Aug and 26 Aug by randomly selecting 100 terminals (PLH) or 100 leaves (WALH) per replicate (400 terminals or leaves per treatment) and examining them for presence of WALH or PLH nymphs. Evaluation of phytotoxicity was made on 13 Jul and 18 Aug by randomly picking 50 leaves and 25 fruit per replicate, and then rating for percentage phytotoxicity.