Abstract
Abstract Seven insecticide treatments, some as combinations, were evaluated for the suppression of Heliothis spp. in cotton at the Texas Agricultural Experiment Station Research Farm at College Station. Cotton was planted 6 Apr in 40-inch rows. A randomized complete block design with 4 replicates was used. Plots of 8 rows by 65 ft were sprayed with a self-propelled, high-clearance sprayer calibrated to deliver 8 gal/acre through 2 TX-6 hollow-cone nozzles/row at 40 psi. Treatments were applied 16, 22, and 30 Jul. Plant damage, insect abundance, and lint yield were estimated from randomly selected locations from the inner 6 rows of each plot. Estimates of egg and larval densities and terminal damage were made once within all plots prior to the first insecticide application. Estimates of plant damage were made by examining 50 randomly selected one-third-grown or larger squares and 50 soft bolls from each plot on the day of, or the day before, insecticides application. In response to observed mite damage, a total of 15 randomly selected leaves from the upper and middle portions of the cotton canopy were collected from each plot and examined for the presence of motile adult mites.
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