Abstract
Abstract This test was designed to evaluate the effectiveness of insecticides for control of cotton aphids in Mississippi. Plots were 4 rows wide and 50 ft long with four untreated rows or a 10 ft planted buffer between plots. Plants in each plot were sampled on a three to four day interval early in the growing season for cotton aphids by selecting ten random plants in each plot. One leaf from the terminal and one leaf four nodes below the terminal (mid level) were sampled on each plant. The total number of aphids on the top leaves and mid leaves was recorded. Treatment was initiated when population levels were rapidly increasing. Insecticide applications were applied on 23 Jun and 10 Jul with a high clearance spray tractor equipped with two TX4 hollow cone nozzles per row traveling 4 mph and delivering 5 gpa. Plots within a replicate were sprayed sequentially to maintain true replicate integrity. Yield was estimated by mechanically harvesting the center two rows of each plot.
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