Wild-Proso Millet (Panicum miliaceum) Control in Soybeans (Glycine max) With Postemergence Herbicides

Selective postemergence herbicides were applied broadcast to control wild-proso millet in soybeans early postemergence (early post), postemergence (post), and late postemergence (late post) when wild-proso millet was 2 to 8 cm tall, 3 to 15 cm tall, and 3 to 31 cm tall, respectively. CGA-82725, fluazifop, haloxyfop, and sethoxydim applied early post controlled 75% or less lateseason wild-proso millet. Intefrow cultivation following early post fluazifop applications improved wild-proso millet control and soybean yields. Higher rates of CGA-82725, haloxyfop, and sethoxydim applied post controlled 91 to 98% late-season millet, but resulting soybean yields were less than the hand-weeded check. Fenoxaprop, fluazifop, fluazifop-P, haloxyfop, quizalofop, and sethoxydim applied late post provided 93 to 99% late-season millet control and soybean yields equal to hand-weeded checks. Wild-proso millet emerging after early post or post herbicide applications contributed to reduced effectiveness from those treatments. However, most wild-proso millet emerged before late post applications and were controlled. Other herbicides including BAS51702, clethodim, cloproxydim, and SC-1084 applied late post also controlled wild-proso millet in soybeans. Nomenclature: BAS-51702, 2-[1-(ethoxyimino)butyl]-3-hydroxy-5-(2Htetrahydrothiopyran-3-yl)-2-cyclohexenl-one; CGA-82725, 2-propynyl 2-[4-j(3,5-dichloro-2pyridinyl)oxy]phenoxy]propionate; clethodim, (E,E)-(?)-2-[1-[[(3-chloro-2-propenyl)oxy]imino] propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one; cloproxydim, (E,EK)-2-[l-[[(3chloro-2-propenyl)oxylimino]butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one; pyridinyl]oxy] phenoxy]propanoic acid; haloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acid; quizalofop, (?)-2-[4-[(6-chloro-2-quinoxalinyl) oxy] phenoxy]propanoic acid; SC-1084, 3-hydroxy-4-[4-[[5-(trifluoromethyl)-2-pyr-idinyl]oxy]phenoxy]pentanoic acid; sethoxydim, 2-[1-(ethoxyinino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen1-one; wild-proso miret, Panicum miliaceum L. ssp. ruderale (Kitagawa) Tzevelev. #3 PANMI; soybean, Glycine max (L.)Merr. Additional index words: Application timing, BAS-51702, CGA-82725, clethodim, cloproxydim, fenoxaprop, fluazifop, haloxyfop, quizalofop, SC-1084, sethoxydim, PANMI.