Abstract
Abstract Dimilin was applied at different degree day intervals after first moth was detected in pheromone traps to determine the best first cover timing of insect growth regulators (IGR) used for codling moth control. Dimilin was applied at 50 (6 May), 125 (16 May) and 200 (20 May) degree days after first moth. No second cover applications against the first generation were made in this test. The experimental design was a randomized complete block with 5 single-tree replicates per treatment. This test was conducted in a 15-year-old apple orchard with under-tree irrigation. After first generation all fruit of each tree was examined and the number of injured apples recorded. Codling moth adult activity was monitored using pheromone traps. Traps were examined weekly and the number of moths recorded. Pheromones were changed every 4 wk, and trap bottoms were changed after an accumulation of 30 moths.
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