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20 January 2018 Preplant followed by postemergence herbicide programs and biologically effective rate of metribuzin for control of glyphosate-resistant common ragweed (Ambrosia artemisiifolia) in soybean
Holly P. Byker, Annemarie C. Van Wely, Amit J. Jhala, Nader Soltani, Darren E. Robinson, Mark B. Lawton, Peter H. Sikkema
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Abstract

With no new herbicides with a novel mode of action in the marketplace in corn–soybean cropping systems, control of glyphosate-resistant (GR) weeds requires the re-evaluation of existing herbicides. This necessitates a renewed focus on using herbicide tank-mixes and sequential herbicide programs while also striving to minimize the environmental impact of weed management. Preliminary research identified four preplant (PP) herbicides (2,4-D, saflufenacil/dimethenamid-P, linuron, and metribuzin) and one postemergence (POST) herbicide (fomesafen) that provided good but inconsistent control of GR common ragweed when applied alone in soybean. The objectives of this study were to determine the biologically effective rate of metribuzin and evaluate PP followed by POST herbicide programs for control of GR common ragweed in soybean. The aforementioned PP herbicides reduced GR common ragweed density and aboveground biomass by 82%–94% and 55%–89%, respectively. In contrast, a PP herbicide followed by fomesafen applied POST decreased common ragweed densities and aboveground biomass by 97%–99% and 93%–98%, respectively. Metribuzin applied at 824 and 1015 g a.i. ha-1 controlled GR common ragweed 90% at 4 and 8 wk after application, respectively. This study concludes that GR common ragweed can be controlled with a PP followed by POST herbicide program and metribuzin has potential for control of GR common ragweed in soybean.

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Holly P. Byker, Annemarie C. Van Wely, Amit J. Jhala, Nader Soltani, Darren E. Robinson, Mark B. Lawton, and Peter H. Sikkema "Preplant followed by postemergence herbicide programs and biologically effective rate of metribuzin for control of glyphosate-resistant common ragweed (Ambrosia artemisiifolia) in soybean," Canadian Journal of Plant Science 98(4), 809-814, (20 January 2018). https://doi.org/10.1139/cjps-2017-0299
Received: 4 October 2017; Accepted: 8 January 2018; Published: 20 January 2018
JOURNAL ARTICLE
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KEYWORDS
biologically effective rate
common ragweed
glyphosate-resistant
metribuzin
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