Control of Afhids on Broccoli, 1991

Broccoli was direct seeded in double-row beds on 15 Jan at the Yuma Valley Agricultural Center, Yuma, AZ. Each plot measured 2 beds by 75 ft long, with an 8 inch spacing between rows and a 40 inch spacing between beds. A single bed was left untreated between each plot. Plants were thinned within rows at 6 inch intervals on 9 Feb. Plots were arranged in a randomized complete block design with 4 replications. Granular insecticides treatments at planting were applied by placing the granules just below the seed line with a Gandy granular applicator mounted on the planter. Plots were subsequently irrigated on 16 Jan. Layby applications of granular treatments were made on 14 Mar by placing the material into the soil just below the roots through shanks mounted to the Gandy granular applicator. Plots were subsequently irrigated on 14 Mar. Aphid populations were assessed on 24 Mar and 8 Apr by randomly removing 10 plants from each replicate and placing them in Berlese funnels. All alate and apterous aphids extracted from the foliage were counted. Data were analyzed with ANOVA and Ryan’s Q test.