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Woolly Cupgrass (Eriochloa villosa) Management in Corn (Zea mays) by Sequential Herbicide Applications and Cultivation

Published online by Cambridge University Press:  20 January 2017

James A. Mickelson  and
R. Gordon Harvey
James A. Mickelson*
Affiliation:
Department of Agronomy, University of Wisconsin-Madison, 1575 Linden Drive, Madison, WI 53706
R. Gordon Harvey
Affiliation:
Department of Agronomy, University of Wisconsin-Madison, 1575 Linden Drive, Madison, WI 53706
*
Corresponding author's E-mail: jmickelson@montana.edu.
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Abstract

Field experiments were conducted in southern Wisconsin from 1996 to 1998 to evaluate the effects of acetochlor applied preemergence (PRE) followed by nicosulfuron or sethoxydim applied postemergence (POST) and of cultivation on woolly cupgrass control, corn grain yield, and woolly cupgrass seed production. Sethoxydim treatments provided greater woolly cupgrass control than nicosulfuron treatments in 1997 and similar control to nicosulfuron treatments in 1996 and 1998. However, neither herbicide killed all emerged woolly cupgrass plants, regardless of herbicide rate or POST application timing. Late postemergence treatments provided greater season-long control than early postemergence treatments in 1996 and 1998, but there was no difference in control between timings in 1997. Acetochlor applied PRE at 1,800 g ai/ha (1×) followed by nicosulfuron (35 g ai/ha) or sethoxydim (213 g ai/ha) at the registered rate (1×) or at one half of the registered rate (0.5×) consistently provided sufficient woolly cupgrass control to maximize corn yield, regardless of cultivation or POST herbicide application timing. Acetochlor PRE treatments, cultivated and noncultivated, followed by sethoxydim POST and cultivated acetochlor PRE treatments followed by nicosulfuron POST treatments provided sufficient control in each year to limit woolly cupgrass seed production to a level that decreased the predicted future seedbank density, regardless of herbicide rate or POST herbicide application timing. However, noncultivated acetochlor treatments followed by nicosulfuron applied at 1× followed by 0.5× or at 0.5× followed by 0.5× did not consistently reduce seed production to a level that decreased the predicted future seedbank density. These results suggest that the rate of sethoxydim can be reduced to 0.5× if a full rate of acetochlor is applied PRE with little effect on corn yield or woolly cupgrass seedbank density. However, reducing the rate of nicosulfuron to 0.5× following an application of acetochlor at the full rate or reducing both the acetochlor and nicosulfuron or sethoxydim rate to 0.5× is recommended only if a cultivation is planned.

Keywords

Acetochlornicosulfuronsethoxydimwoolly cupgrass, Eriochloa villosa (Thunb.) Kunth #3 ERBVIcorn, Zea mays L. ‘DeKalb SR404’, ‘DeKalb DK493SR’Acetochlor, herbicide rate, herbicide application timing, nicosulfuron, sethoxydim, sethoxydim-resistant corn, woolly cupgrass seed productionCOC, crop oil concentrateDAT, days after treatmentEPOST, early postemergenceLPOST, late postemergenceOM, organic matterPOST, postemergencePRE, preemergenceUAN, urea ammonium nitrate
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 502 - 510
Copyright
Copyright © Weed Science Society of America 

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References

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