Abstract
Abstract Three postemergence-applied insecticides were evaluated at 3 different rates, to determine their potential for protecting wheat already infested with Hessian fly eggs. Insecticides were applied 13 Dec to durum wheat at the 2-leaf stage, growing on the SOGETA Farm, 3 km west of Settat, Morocco. Five to 10 unhatched fly eggs were present per plant, mostly on the first leaf. Treatments were applied with a CO2-powered, hand-carried plot sprayer, with flat-fan (8001) tips, calibrated to deliver 24 gpa at 40 psi. Plots were 1.8m by 10m, replicated 4 times in a RCB design. Air temperature at application was 21°C. Weather was sunny and warm for 14 days following treatment, followed by a cool, rainy period. Twenty days after treatment, 10 plants were sampled from each plot and evaluated for tiller number, total living larvae per plant, percent of tillers with living fly larvae, and percent of plants with living larvae.
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