Abstract
Abstract Greenhouse grown cabbage plants were transplanted on 27 Apr into a Bernow series sandy loam soil at the Wes Watkins AREC in Lane, OK. Plots measuring one row wide by 4.6 m long were arranged in a randomized complete block design with four replications. Spray buffers of one row between rows and 3 m within rows were left unplanted. Double-row beds were spaced 0.9 m apart with 30 cm interplant spacing. Conventional cultural practices were used throughout the trial. All treatments were applied on 26 May, 4, 14 and 24 Jun with a CO2-powered backpack sprayer calibrated on 3 May at 205 liters per acre. The boom was configured with two TX-26 (hollow cone) spray nozzles spaced 46 cm apart and directed inward towards the base of the plants. On each sample date, five randomly selected plants per plot were sampled for CL, thrips and HB. All heads were harvested on 2 Jul and evaluated for insect damage according to the following scale: 1 = no wrapper leaf damage, no head damage, 2 = wrapper leaf damage, no head damage, 3 = light head damage (3 or less feeding holes), 4 = moderate/severe head damage (>3 feeding holes). Heads rated 1 or 2 were considered marketable in accordance with USDA market standards.
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