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Dose-Responses of Weeds and Winter Wheat (Triticum aestivum) to MON 37500

Published online by Cambridge University Press:  12 June 2017

Patrick W. Geier  and
Phillip W. Stahlman
Patrick W. Geier
Affiliation:
Kansas State Univ. Agric. Res. Ctr-Hays, Hays, KS 67601
Phillip W. Stahlman
Affiliation:
Kansas State Univ. Agric. Res. Ctr-Hays, Hays, KS 67601
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Abstract

Greenhouse studies determined the dose-responses of cheat, downy brome, Japanese brome, jointed goatgrass, and winter wheat to preplant-incorporated MON 37500 and its residual effects on kochia. Concentrations of MON 37500 up to 60 ppbw did not affect winter wheat. MON 37500 did not prevent weed emergence, but increasingly inhibited weed growth as the dose was increased up to about 20 ppbw. GR50 values were 16, 16, 11, and 31 ppbw for cheat, downy brome, Japanese brome, and jointed goatgrass, respectively. Japanese brome was more susceptible than cheat or downy brome, and jointed goatgrass tolerated two to three times more MON 37500 than the Bromus species. Plant dry weights of kochia seeded after removal of the winter annual grasses decreased with increasing initial MON 37500 concentrations up to 20 ppbw. Kochia density was influenced by which winter annual grass was grown previously.

Keywords

MON 37500, 1-(2-ethylsulfonylimidazo[1,2-a]pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)ureacheat, Bromus secalinus L. # BROSEdowny brome, Bromus tectorum L. # BROTEJapanese brome, Bromus japonicus Thunb. ex Murr. # BROJAjointed goatgrass, Aegilops cylindrica Host # AEGCYkochia, Kochia scoparia (L.) Schrad. # KCHSCwinter wheat, Triticum aestivum L. ‘Ike.’Aegilops cylindricaBromus japonicusBromus secalinusBromus tectorumKochia scopariaAEGCYBROJABROSEBROTEKCHSC
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 870 - 875
Copyright
Copyright © 1996 by the Weed Science Society of America 

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