Abstract
Abstract Spinosad DE-105 1.6% was evaluated for its ability to control OBLR larvae of the summer generation. The test was conducted in an apple orchard at Mattawa, WA. The trees were 3-yr-old Delicious on dwarfing roots. Treatments were applied to 8-tree plots replicated 5 times in a randomized complete block. All treatments were applied with a handgun sprayer at 300 psi to the point of drip, simulating a dilute spray of approximately 400 gpa. The 50% egg hatch and 50% + 14 d treatments were applied 28 Jun and 10 Jul, and the 100% egg hatch and 100% + 14 d treatments were applied 10 Jul and 24 Jul. The post-treatment evaluation was made on 28 Jul. The total number of live OBLR larvae found in a 10-min search on all 8 trees of a treatment replication was counted.
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