Abstract
Abstract Different B. thuringiensis products were evaluated for their ability to control OBLR larvae of the overwintering generation. The test was conducted in an apple orchard near Milton-Freewater, OR. Trees were 4-yr-old ‘Fuji’ on dwarfing roots. Treatments were applied to four-tree plots replicated five times in a RCBD. All treatments were applied with a handgun sprayer at 300 psi to the point of drip, simulating a dilute spray of approximately 400 gpa. Application dates and plant development stages are shown in the table. The post-treatment evaluation was made on 20 May. Each tree was examined and the no. of live leafroller larvae recorded.
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