Control of Secondary Pests, 1988

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Abstract
Cotton was planted 15 Apr at the Texas Agricultural Experiment Station annex farm in Mercedes. The experimental design was a randomized complete block with 5 replicates. Plots were 2 beds wide and 40 ft long with 2 beds of sorghum between plots and 20-ft alleys between plots in rows. Applications were made with a tractor-mounted CO2-powered sprayer that delivered 20 gal/acre. Three nozzles were used for each bed, 1 over the top of plants and 1 on a drop on each side of the plants. All plots were treated with cypermethrin (0.01 lb [AI]/acre) at 7-d intervals to induce secondary pest population increases. Experimental treatments consisted of applications of Curacron 8 EC (0.75 lb [AI]/acre) to control secondary pests at various action threshold levels based on survey counts of pests from the previous week. Surveys were conducted at 7-d intervals by collecting the third fully expanded leaf down from the terminal of each of 3 plants/plot. Leaves were returned to the laboratory and mites and aphids were counted.

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