Evaluation of Pyrethroids and Selected Insecticides for Control of Cabbage Looper in Broccoli

Broccoli was direct seeded into double-row beds on 21 Sep at the Yuma Valley Agricultural Center, Yuma, AZ. Each plot consisted of four, 30 ft long beds spaced 42 inches apart and bordered on each side by an untreated bed. Plots were arranged in a CRB design with 4 replicates. Foliar applications were made on 30 Oct and 4 Nov with a hand-held CO2 sprayer operated at 50 psi, delivering 20 gpa. Spreader-sticker (Kinetic) was included in all spray treatments at a rate of 0.125% of the total volume. Insecticide efficacy was determined by counting the total number of small (1 st and 2nd instars) and large (>2nd instar) CL larvae on 5 randomly selected broccoli plants per replicate. A pre-treatment sample was taken on 29 Oct and evaluations were made 5 DAT on 4 and 9 Nov. Data were analyzed as a 1-way ANOVA using a protected LSD F test to distinguish treatment mean differences.