Abstract

Abstract Treatments were tested for relative efficacy against cotton aphid in nonirrigated cotton planted 4 May at Stoneville, MS. Plots of 8 rows (40 inch centers) by 50 ft, separated by 15 ft alleys, were arranged in a randomized complete block with 4 replicates. Treatments were applied on 10 Jul (Trials 1 and 2) and 28 Jul (Trial 3) with a high-clearance spray machine equipped with a compressed-air spray system. Total spray volume was 6 gal/acre at 5 mph and 35 psi using 2, TX10 nozzles/row. Plots within a replicate were sprayed consecutively with the boom rinsed twice and blown clear between plots. In Trial 1, a pretreatment survey on 9 Jul indicated a moderate aphid infestation. In Trial 2, pretreatment counts were made on 9 Jul. Posttreatment aphid counts in both trials were made on 13 Jul and 17 Jul. In Trial 3, pretreatment counts were made on 28 Jul; posttreatment aphid counts were made on 3 Aug. Efficacy of treatments was evaluated by counting aphids within 1.0 inch2 on the under surface of a leaf in the top, middle and bottom ⅓ of 40 randomly chosen plants/treatment (Trials 1 and 2) or, similarly, only in the top and middle ⅓ portions (Trial 3)

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