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Nematicide Treatment Effects on Reniform Nematodes in Cotton

Stephen J. Komar, Paul D. Wigley, Robert C. Kemerait, and William D. Shurley

ABSTRACT

A split-plot experiment was conducted to evaluate reniform nematode Rotylenchulus reniformis control options in cotton. Main plot treatments included, 1,3- dichloropropene (Telone II) injected behind the sub-soil shank and no Telone application. Sub plot treatments included, oxamyl (Vydate C-LV), two at planting rates (3.5 and 6 lbs) aldicarb (Temik 15G), and a split-application of Temik (6 lbs AP + 7 lbs at pinhead square). All treatments provided a numerical reduction in nematode population at early square. The addition of Telone II provided a significant reduction in nematode population in all treatments (P= 0.05). Nematode populations increased above treatment threshold levels mid-season in all treatments with the exception of two lowest rates of Temik during the 2001 season. Nematode levels were variable in the test field during the 2002 season. The addition of Telone II increased yields in all treatments by nearly 100 pounds per-acre during the 2001 season, with the greatest yields being recorded in the Telone plus Vydate and the Telone plus Temik (6 lbs AP + 7 lbs 45 DAP). Differences were observed in net returns per-acre in 2001 ranging from $18 to $ 90 over the control (Temik 3.5 lbs AP). No differences were observed among treatments in yield or net returns during the 2002 growing-season.





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Document last modified April 16, 2003