Response of Rotylenchulus reniformis to Nematicide Applications on Cotton
AbstractField experiments were conducted to evaluate the efficacy of five nematicides for the management of Rotylenchulus reniformis and for their effects on growth, development, and yield of cotton. Treatments included 1,3-dichloropropene (1,3-D), fenamiphos, phorate, terbufos, aldicarb, and 1,3-D + aldicarb. Average R. reniformis population densities across all treatments increased from 5,284 at 10 days after planting to a final density at harvest of 15,622 nematodes/500 cm³ soil. The 1,3-D + aldicarb combination was the only treatment with an average R. reniformis population density significantly (P = 0.05) lower than that of the untreated control. Seedling stand at 28 days after planting was significantly less in aldicarb-treated plots than in control plots. Plant height was significantly greater in plots treated with nematicides than in the controls. Seed cotton yield was significantly greater from treated plots. Cotton plots treated with the 1,3-D + aldicarb combination produced the highest average yield of 4,139 kg/ha. Key words: 1,3-dichloropropene (1,3-D), aldicarb, chemical control, cotton, fenamiphos, Gossypium hirsutum, nematicide, phorate, reniform nematode, Rotylenchulus reniformis, terbufos.
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