Abstract
Abstract Lettuce was direct seeded into double-rows on 42-in beds on 12 Sep 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 randomized complete block 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. Treatment rates were determined by equating cost/acre based on 1.0 lb of Javelin WDG, or $10.22 worth of product. All treatment applications included Dyne-Amic spreader-sticker at 0.25% v/v. Treatments were applied on Oct 6, Oct 14 and Oct 25. Evaluations were made five to six days after treatment (Oct 4, Oct 12, Oct 19 and Nov 1) by randomly selecting ten plants per plot and counting the number of live large (>2nd instar) CL larvae. Data were analyzed for treatment differences using ANOVA and an F protected LSD.
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