Seasonal Control of Cabbage Lepidopterous Pests, 1992

Greenhouse seedlings were transplanted at the Entomology Research Farm, Michigan State University on 7 and 8 Jul. Spacing was 2 ft between plants and 5 ft between rows. Plots were 25 ft long and one row wide. Treatments were arranged in a randomized complete block design where two replicates had a single buffer row between adjacent plots (alternate row spray) and four replicates had no buffer rows (blanket spray) which created an unbalanced factorial design. Application were made on 4, 10, 17 and 24 Aug using a hand-held CO2 sprayer (30 GPA and 50 psi), with a single flat-fan nozzle directed downward 2 ft over the top of the plant. Insects on two plants were counted on 3, 4, 14, 20 and 27 Aug. On 6 Sep, up to five heads per plot were harvested and inspected for larvae.