Apple Pandemis Control, Pre-Bloom Application, 1984

Three commercial apple orchards near Wenatchee, WA, were found to have moderate to high levels of apple pandemis larvae during the delayed dormant period. Orchards 1 and 2 contained older trees (20-30 years) 14-16 ft tall and planted on a 20 ft × 20 ft spacing. Trees in orchard 3 were 8-10 ft tall (15 yr old) planted on a 7 ft × 16 ft spacing. Twenty-five trees were selected in orchards 1 and 2. Ten fruit buds per tree from a high (>6 ft) and low level were sampled just prior to and 7-10 days posttreatment. In orchard 3, 10 fruit buds per tree were sampled from 50 trees. All fruit buds were returned to the laboratory, examined under a binocular microscope and numbers of injured and infested buds recorded. All orchards were treated with Lorsban and oil by airblast sprayer at 400 gal per acre between 4-11 Apr.