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Selected foliar insecticides were evaluated for controlling the Hessian fly during the panicle emergence and grain-filling phase of wheat growth. Trial 1 was conducted at the Bledsoe research farm in northern Pike Co., GA. Trials 2, 3 and 4 were conducted in Sumter Co. near Plains, GA. Seed were planted in 8 inch rows at 90 lb/acre using a grain drill on 20 Oct 1986 in Trial 1, 29 Oct 1986 in Trial 2 and 3, and 1 Dec 1987 in Trial 4. Plots measured 7 by 20 ft in each trial and were arranged in a randomized complete block design with 4 replications. Insecticides were applied with a CO2-powered backpack sprayer equipped with No. 4 flat fan nozzles which delivered 27.5 gal/acre. Plots in Trial 1 were treated on 1 Mar 1987 during the mid-joint stage. Plots in Trials 2 and 3 were treated at anthesis on 1 Apr 1987. Plants in Trial 4 were treated in the flag leaf stage on 8 Apr 1988. Hessian fly infestations were sampled in each plot by digging plants in a 1-ft section of row and determining the percentage of infested tillers. Pretreatment samples were taken 1 day before application. Posttreatment samples were taken on 25 May in Trial 1 and 12 May in Trial 2 and 3. Plots were harvested with a small plot combine. Grain weight, test weight and moisture content were meausred and yield was adjusted to 13.5% moisture content.

Hessian Fly Control in Winter Wheat with Spring-Applied Foliar Insecticides, 1986, 1987