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Efficacy of Cythion RTU, Orthene and Monitor Against Early-Season Insect Pests on Cotton, 1986


 A small-plot field study was conducted at the Texas A&M Research and Extension Center at Corpus Christi, TX, to evaluate selected insecticides for control of early season insect pests on dryland cotton. Four treatments and an untreated were compared in 4-row by 50-ft plots of cotton planted 22 Mar on 38-inch rows. Treatments were replicated 4 times in a randomized complete block design. Treatments were applied beginning at pinhead-square stage on 24, 29 Apr, 6 and 13 May. Applications were made with a CO2 pressurized (36 psi) backpack sprayer equipped with size 3-X hollow-cone nozzles. The application made on 24 Apr was directed over the row bed (i.e., one nozzle/row) at 2.2 gal total spray/acre, whereas all other applications were broadcasted over the row bed and middles (i.e., three nozzles/row) at 6.4 gal total spray/acre. Efficacy of treatments was evaluated by inspecting: (1) the terminals of 20 randomly chosen plants in each plot for the presence of fleahopper nymphs and thrips, and (2) the terminal leaves (third leaf from apex) of 10 randomly chosen plants in each plot for the presence of aphids. Seed cotton was hand-harvested twice from a 6.8-ft section of row in each plot for yield analysis.