Insect Control on Broccoli, 1987

Broccoli was transplanted at the MSU Entomology Research Farm on 3 Jun. Plots were 3 rows wide (36-inch row spacing with 18 inches between plants) and 30 ft long. Starter fertilizer (20-20-20 soluble fertilizer) was added at transplanting. A Lorsban drench (3.3 oz/1000 row ft) was applied on 9 Jun to control cabbage maggot. Treatments were arranged in a completely randomized design with 4 replications per treatment. Treatments were applied with a hand-held CO2 sprayer at 30 gpa and 40 psi on 26 Jun and 2, 10, and 17 Jul. Insect counts were made of 3 randomly selected plants from the center row of each plot on 29 Jun, 7 and 20 Jul. On 20 Jul, 5 broccoli heads were harvested from the center row of each plot and examined for caterpillar infestation. Data were analyzed by a one-way analysis of variance. A Bartlett’s test was used to check for homogeneity of variance. Where significant results were obtained, a SNK test was used to separate means.