Abstract
Abstract Twenty treatments were tested for relative efficacy against cotton aphid in nonirrigated cotton planted 23 May. Plots of 8 rows (40 inch) centers by 30 ft, separated by 15 ft alleys, were located on the Delta Branch Experiment Station, Stoneville, MS. Treatments were arranged in a randomized complete block with 4 replicates. Treatments were applied by a high-clearance spray machine equipped with a compressed-air spray system. Trial 1 was applied on 5 Jun and Trial 2 was applied on 21 Jun. Total spray volume was 5 gal/acre at 5 mph and 40 psi using 2 TX6 nozzles/row. Plots within a replicate were sprayed consecutively with the boom rinsed twice and blown clear between plots. Efficacy of treatments was evaluated 72-h post-treatment by counting aphids within one square inch at the terminal and one square inch on the under surface of the third leaf from the terminal on 40 randomly chosen plants/treatment.
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