Insecticidal Control of Walnut Husk Fly in Walnuts, 2015

This study was designed to evaluate the efficacy of reduced-risk insecticides for WHF control. The study was conducted in an untreated “Hartley” walnut orchard near Hollister, CA. Ten treatments were replicated four times in an RCB design. Each replicate was a single tree. The orchard was planted with 7.3 m × 7.3 m spacing. Materials were applied with a hand-held orchard sprayer operating at 1,723.7 kPa with a finished spray volume of 2,806.2 liters/ha. Treatments were applied 1 wk after …