Abstract
Abstract Lettuce was direct seeded into double-rows on 42-in beds on Sep 4 at the Yuma Valley Agricultural Center, Yuma, AZ. Plots were four beds wide by 30 ft long. Each plot was bordered on each side by two blank beds. Plots were arranged in a RCB design with four replicates. Treatments were applied using a tractor-mounted sprayer with two TX-18 hollow cone nozzles per bed, calibrated to deliver 60 gal/acre at 300 psi. All treatment applications included Triton B-1956 surfactant at 0.05% v/v. Treatments were applied on Sep 27, Oct 6 and Oct 12. Evaluations were made five to six days after treatment (Sep 26, Oct 4, Oct 11 and Oct 18) by randomly selecting ten plants per plot and counting the number of live large (>2nd instar) BAW and CL larvae. Data were analyzed for treatment differences using ANOVA and an F protected LSD.
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