Postemergence Weed Control in Peanut Using Reduced Rate or Combinations of Imazapic and Imazethapyr
2010
Grichar, W James | Dotray, Peter A. | Baughman, Todd A.
Studies were conducted in different Texas peanut (Arachis hypogaea L.) production regions to evaluate POST applications of imazapic and imazethapyr at ½× (0.035 kg ai/ha) or 1× (0.07 kg ai/ha) of the manufacturers' suggested use rate and in combination with acifluorfen at 0.42 kg ai/ha, acifluorfen at 0.105 kg ai/ha plus bentazon at 0.05 kg ai/ha, or 2,4-DB at 0.28 kg ai/ha. Palmer amaranth (Amaranthus palmeri S. Wats) control was most consistent with imazapic or imazethapyr plus 2,4-DB. Imazapic in combination with 2,4-DB or acifluorfen plus bentazon controlled ivyleaf morningglory [Ipomoea hederacea (L.) Jacq] at least 75%. Smellmelon (Cucumis melo L. var. Dudaim Naud.) control was at least 95% with 1× imazapic. Imazapic at 1× in combination with acifluorfen controlled desert horse purslane (Trianthema portulacastrum L.) over 90%. No peanut stunting was noted at Yoakum with any treatment; however, at Lamesa, Lockett, and Quitaque peanut stunting was noted. Although 1× imazapic or imazethapyr provided slightly more consistent weed control than the ½× rate, peanut yield did not increase with higher rate. Therefore, growers may be able to reduce production costs with lower rates of imazapic or imazethapyr.
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