Abstract
Abstract Green house transplants were planted 30 May into plots 4 rows wide by 25 ft long, 15 plants/row, at the University of Illinois Vegetable Crops Farm, Champaign. Plots were replicated 4 times in a randomized complete block design. Each formulation contained the same amount of Bacillus thuringiensis var. kurstaki. Triton CS-7 adjuvant (6 oz/acre) was added to all treatments. Sprays were applied with 3 hollow cone nozzles (Conejet TXSS-8)/row from a 4-row sprayer delivering 30 gal/acre at 50 psi on 28 Jun, 18, 26 Jul, and 1 Aug. Heavy rainfall the week of 8 Jul prevented a scheduled application. Two destructive samples (5 plants/plot in the first sampling, 4 plants/plot in the second sampling) were taken 1 Jul and 4-8 Aug. Laboratory bioassays (see Paper 2L) were done with treated foliage from these plots to determine residual efficacy against DBM. Quality ratings (Greene et al. 1969. J. Econ. Entomol. 62:798-800) of mature cabbage heads (5 plants per plot) were determined 9 Aug.
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