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Woolly Cupgrass (Eriochloa villosa) Control in Corn (Zea mays) with Pendimethalin/Triazine Combinations and Cultivation

Published online by Cambridge University Press:  12 June 2017

Joseph F. Schuh  and
R. Gordon Harvey
Joseph F. Schuh
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
R. Gordon Harvey
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
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Abstract

In 1985, 1986, and 1987, pendimethalin at 1.7 kg ai/ha plus 2.2 kg ai/ha cyanazine, 2.2 kg ai/ha atrazine, or 1.1 kg/ha atrazine plus 1.1 kg/ha cyanazine was applied delayed preemergence, early postemergence, and postemergence with and without cultivation to evaluate woolly cupgrass control and corn injury. Results varied from year to year. Dry conditions in 1985 resulted in poorer woolly cupgrass control while cold and wet environments in 1987 resulted in corn injury and reduced yields from postemergence treatments containing cyanazine. Good early-season suppression of woolly cupgrass deteriorated to less than 75% control by the late-season evaluation in all experiments. The best woolly cupgrass control and highest corn yields were usually achieved when herbicide applications were followed by row cultivation. Corn yield increases averaged 28, 17, and 11% in 1985, 1986, and 1987, respectively, when a herbicide treatment was followed by row cultivation. Pendimethalin/triazine treatments followed with a row cultivation adequately suppressed woolly cupgrass in field corn, but adverse environmental conditions often reduced herbicide effectiveness or increased corn injury.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminecyanazine, 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino]-2-methylpropanenitrilependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminewoolly cupgrass, Eriochloa villosa (Thunb.)Kunth. ♯3 ERBVIcorn, Zea mays L. ‘Pioneer 3747′Atrazinecyanazineintegrated controlERBVI
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 3 , May 1989 , pp. 405 - 411
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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