Control of Codling Moth in Walnuts, 2015

This study was designed to evaluate the efficacy of reduced-risk insecticides for CM control. The study was conducted in an untreated “Payne” walnut orchard near Tracy, CA. Twelve treatments were replicated four times in an RCB design. Each replicate was a single tree. The orchard was planted with 6.1 m × 12.2 m spacing. Materials were applied with a hand-held orchard sprayer operating at 1,723.7 kPa with a finished spray volume of 2,338.5 liters/ha. Applications were based on degree-days (DD). DD were calculated using a single sine horizontal cutoff model with a lower threshold of 10°C and an upper threshold of 31.1°C. Maximum and minimum air temperatures were …