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Sequential Applications Control Woolly Cupgrass (Eriochloa villosa) and Wild-Proso Millet (Panicum miliaceum) in Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Thomas L. Rabaey  and
R. Gordon Harvey
Thomas L. Rabaey
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706-1597
R. Gordon Harvey
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706-1597
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Abstract

Field studies were conducted in 1994 and 1995 to determine the contribution of PRE applications of alachlor, metolachlor, acetochlor, SAN 582H, or pendimethalin on woolly cupgrass and wild-proso millet control when followed by POST nicosulfuron at 0, 0.018, 0.027, or 0.036 kg ai/ha. Sequential treatments controlled woolly cupgrass and wild-proso millet greater than single applications of PRE herbicides, which when applied alone resulted in the least wild-proso millet control and lowest corn grain yield. Lack of complete woolly cupgrass control with POST nicosulfuron alone resulted in corn grain yield that was less than with sequential treatments but was equal to PRE treatments. Wild-proso millet control with nicosulfuron at 0.027 kg/ha resulted in corn grain yield that was less than with sequential treatments, but greater than with all PRE treatments except for SAN 582H. All PRE herbicides, regardless of early season performance, when followed by nicosulfuron resulted in woolly cupgrass and wild-proso millet control that was similar. Woolly cupgrass seed production compared to the nontreated check was reduced 98% with acetochlor followed by nicosulfuron. Sequential treatments provided the most consistent woolly cupgrass and wild-proso millet control, the highest corn grain yield, and the greatest reduction in woolly cupgrass and wild-proso millet seed production.

Keywords

Acetochlor, 2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamidealachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamideSAN 582H, 2-chloro-N-[(1-methyl-2-methoxy)ethyl]-N-(2,4-dimethyl-thien-3-yl)acetamidemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidenicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamidependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminewild-proso millet, Panicum miliaceum L. ssp. ruderale (Kitagawa) Tzevelev. # PANMIwoolly cupgrass, Eriochloa villosa (Thunb.) Kunth # ERBVIfield corn, Zea mays L. ‘Pioneer 3751.’Reduced herbicide ratesseed collectionweed seed productionacetochloralachlorSAN 582HmetolachlornicosulfuronpendimethalinPOST, postemergencePPI, preplant incorporationPRE, preemergenceWAP, weeks after planting
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 537 - 542
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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