A reliable monitoring technique is to estimate egg hatch by counting ten to twelve days from the first adult catch in pheromone traps. Watch for the presence of larvae on foliage, particularly watersprouts, in late June, early August, and September. Pupating larvae and pupae can be located by searching for folded leaves. Egg parasites are very effective biological control agents in unsprayed trees, but are apparently eliminated by the sprays applied in commercial orchards. Chemical sprays directed at RBLR larvae in apple orchards are typically applied at petal fall and in cover sprays according to action thresholds.
Thorough coverage is essential for good control.
During the last several years, pink and petal fall sprays have adequately controlled this pest. For correct pest management procedures, growers should consult local Cooperative Extension recommendations. Photo layout by R. McMillen-Sticht. Produced through the New York State Integrated Pest Management Program, jointly sponsored by the New York State Department of Agriculture and Markets and Cornell University. Cornell Cooperative Extension provides equal program and employment opportunities.