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Common waterhemp (Amaranthus rudis) interference in soybean

Published online by Cambridge University Press:  20 January 2017

Aaron G. Hager ,
Loyd M. Wax ,
Edward W. Stoller  and
Germán A. Bollero
Loyd M. Wax
Affiliation:
United States Department of Agriculture, Agricultural Research Service, University of Illinois, Urbana, IL 61801
Edward W. Stoller
Affiliation:
United States Department of Agriculture, Agricultural Research Service, University of Illinois, Urbana, IL 61801
Germán A. Bollero
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
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Abstract

Common waterhemp has become a problem weed species in Midwest soybean production. Determining the critical interference period after soybean and common waterhemp emergence is necessary for the implementation of weed control practices before soybean seed yield loss occurs. Field experiments were conducted during 1996, 1997, and 1998 to determine the influence of duration of common waterhemp interference on soybean seed yield. Removal of common waterhemp 2 wk after soybean unifoliolate leaf expansion resulted in soybean seed yield equivalent to a season-long weed-free control. Delaying common waterhemp removal until 4 wk after soybean unifoliolate leaf expansion resulted in decreased soybean seed yield. Allowing common waterhemp interference to persist 10 wk after soybean unifoliolate leaf expansion reduced soybean seed yield by an average of 43% over 3 yr. These results suggest that soybean producers should implement common waterhemp management strategies earlier than 4 wk after soybean unifoliolate leaf expansion in order to reduce the potential loss of soybean seed yield.

Keywords

Acifluorfensethoxydimcommon waterhemp, Amaranthus rudis Sauer. AMATAsoybean, Glycine max (L.) Merr. ‘Pioneer 9362’, ‘Pioneer 9363’Weed competitioninterference removal timing
Type
Research Article
Information
Weed Science , Volume 50 , Issue 5 , October 2002 , pp. 607 - 610
Copyright
Copyright © Weed Science Society of America 

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