Efficacy of Dipel and Asana Against Lepidopterous Defoliators on Collards, 1987

Collards were planted in greenhouse flats 9 Apr then transplanted to a field location 7 May. Experimental design was a randomized complete block arrangement with 4 replicates. Plot size was 1 row of 25 plants spaced 12 inches apart. Treatments were applied weekly from 15 May through 19 Jun with a CO2-powered backpack sprayer set to deliver 25 gal/acre at 30 psi. Efficacy was determined from periodic larval and pupal counts. On each sampling date, 3 randomly selected plants from each plot were cut at ground level, leaves were removed and examined individually in the field, and all lepidopterous larvae and pupae were recorded.