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Postemergence-Directed Herbicides Control Wild-Proso Millet (Panicum miliaceum) in Sweet Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Craig D. Kleppe  and
Robert G. Harvey
Craig D. Kleppe
Affiliation:
Dep. Agron., Univ. Wis., Madison, WI 53706
Robert G. Harvey
Affiliation:
Dep. Agron., Univ. Wis., Madison, WI 53706
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Abstract

Thirty-six postemergence-directed (PDIR) herbicide treatments, applied with a precision PDIR sprayer, were evaluated for wild-proso millet (PANMI) control in sweet corn field trials in Wisconsin from 1987 to 1990. The performance of butylate and cyanazine (B + C), applied to suppress PANMI early in the season and to provide a height differential between corn and PANMI, greatly influenced PANMI control with PDIR treatments. PDIR treatments controlled PANMI greater than 90% when PANMI was effectively suppressed by B + C, but poor PANMI suppression reduced PDIR herbicide efficacy. Generally, PDIR treatments of paraquat or sethoxydim most effectively controlled PANMI. Paraquat alone at 545 g ha–1 or combined with simazine or sethoxydim at 57 and 114 g ha–1, and sethoxydim at 170 and 227 g ha–1 plus an adjuvant controlled PANMI greater than 95%. PDIR applications of ametryn, linuron, sethoxydim at 57 to 227 g ha–1 alone, sethoxydim at less than 114 g ha–1 plus an adjuvant, and sethoxydim at 114 g ha–1 tank mixed with either of four other herbicides controlled less than 86% of PANMI. Tank mixing a photosynthetic inhibitor or sethoxydim with paraquat did not improve PANMI control compared with paraquat alone. PANMI control with sethoxydim plus an adjuvant at 114 g ha–1 was similar to 227 g ha–1. There was no difference in PANMI control with sethoxydim applied with crop oil concentrate or BCH-815. With the exception of glyphosate at 318 g ha–1 and sethoxydim at 227 g ha–1 plus an adjuvant, PDIR treatments did not injure sweet corn in 1987, 1988, or 1990. However, sethoxydim in 1989 at all rates severely injured corn.

Keywords

Ametryn, N-ethyl-N′-(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diaminebutylate, S-ethyl bis(2-methylpropyl)carbamothioate]cyanazine, 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino]-2-methylpropanenitrileglyphosate, N-(phosphonomethyl)glycinelinuron, N′-(3,4-dichlorophenyl)-N-methoxy-N-methylureaparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onesimazine, 6-chloro-N,N′-diethyl-1,3,5-triazine-2,4-diaminewild-proso millet, Panicum miliaceum L. ssp. ruderale (Kitagawa) Tzevelev. ♯ PANMIcorn, Zea mays L., ‘Pillsbury-Green Giant No. 40’Dual orifice nozzlesskidstank mixametrynBCH-815butylatecrop oil concentratecyanazineglyphosatelinuronparaquatsethoxydimsimazinePANMI
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 746 - 752
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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