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Relating Eriochloa villosa emergence to interference in Zea mays

Published online by Cambridge University Press:  12 June 2017

James A. Mickelson  and
R. Gordon Harvey
R. Gordon Harvey
Affiliation:
University of Wisconsin-Madison, Department of Agronomy, 1575 Linden Drive, Madison, WI 53706
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Abstract

Critical period experiments were conducted in 1997 near Milton, WI, and in 1998 near Edgerton, WI, in which Eriochloa villosa (Thunb.) Kunth emergence was characterized and related to Zea mays L. yield loss and weed seed production. At Milton, 2.7% of the spring seedbank emerged, and at Edgerton, 14.5% of the spring seedbank emerged. Peak time of E. villosa emergence occurred early in the season at both locations, accounting for 84% of the total season emergence at Milton by 37 d after planting and 90% of the total season emergence at Edgerton by 27 d after planting. A secondary peak in emergence occurred at each site, accounting for 14% of the total season emergence at Milton between 38 and 52 d after planting and 8% of the total season emergence at Edgerton between 28 and 43 d after planting. Following the secondary peak in emergence at each site, approximately 2% of the total season emergence occurred. Zea mays grain yield was reduced when E. villosa interfered with Z. mays past the V11 stage at Milton and the V3 stage at Edgerton. Zea mays yield reductions at Edgerton were greater, occurred under shorter periods of weed interference, and were associated with greater E. villosa biomass than yield reductions at Milton. Eriochloa villosa that emerged after the V2 Z. mays stage at Milton and the V3 stage at Edgerton did not cause crop yield loss; however, these plants produced seed at 143 and 63% of the initial spring seedbanks, respectively.

Keywords

Eriochloa villosa (Thunb.) Kunth ERBVI, woolly cupgrassZea mays L., corn, ‘Cargill 4850 LL’ and ‘Cargill 3650 LL.’Weed emergenceweed seed productioncritical periodfecundityERBVI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 5 , October 1999 , pp. 571 - 577
Copyright
Copyright © 1999 by the Weed Science Society of America 

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