Abstract
Abstract Greenhouse-grown seedlings were transplanted 11 Feb. in single rows on raised polyethylene-mulched beds of fumigated, sandy soil as a follow-up crop to fall corn. Plots were single-rows 24 ft long on 6 ft centers and experimental design was randomized complete block with 3 treatments and 4 replicates. Fall-planted collards were left at the ends of each plot to provide inoculum. Infestations of DBM and CSCW on cabbage were confirmed before weekly treatments commenced on 16 Mar using a CO2 backpack sprayer with a single nozzle calibrated for 39 gal/acre at 50 psi. Controls were unsprayed. A nonionic surfactant, APSA, was added to both spray mixtures at the rate of 3 oz/100 gal. Evaluations 3 days post-spray on 10 randomly selected plants per plot consisted of counts and percent damage estimates on the 5 outer head and 5 inner wrapper leaves. The 15 largest heads per plot were harvested and graded for marketability and weighed on 26 Apr. Heads were considered nonmarketable if there was insect damage in excess of 5% on the head or 10% on the wrapper leaves.
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