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Response of Setaria faberi demographic processes to herbicide rates

Published online by Cambridge University Press:  20 January 2017

Alvin J. Bussan ,
Chris M. Boerboom  and
David E. Stoltenberg
Chris M. Boerboom
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
David E. Stoltenberg
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
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Abstract

Traditionally, herbicide efficacy has been evaluated by visual ratings, but these data provide little insight to the biological response of weeds to herbicides. Field studies were conducted in 1995 and 1996 to determine the rate response of Setaria faberi seedling survival, seed production, and biomass to postemergence herbicides in Zea mays and Glycine max. Nicosulfuron and sethoxydim were applied to Z. mays and G. max, respectively, at 1×, 12×, 14×, 18×, 116×, 132×, and 0× the label rate. Mature plant density of S. faberi was linearly related to seedling density, indicating that seedling survival was not density dependent. Based on a nonlinear dose–response analysis, maximum S. faberi survival was 55% in Z. mays across years and 60 and 45% in G. max in 1995 and 1996, respectively. Minimum survival was 0% except for Z. mays in 1996 when it was 13%. The minimum survival was greater in Z. mays in 1996 due to greater survival of late cohorts than in 1995. Setaria faberi seedling survival was greater in 12× than 1× herbicide treatments in Z. mays and G. max each year. Setaria faberi seed production was related to mature plant density with a negative exponential function. Seed production per plant was similar between 1× and 12× rates in Z. mays and among 1×, 12×, and 14× rates in G. max each year. However, seed production per square meter was greater in 12× than 1× treatments due to greater seedling survival. Regardless, seed production per square meter was 95% less in the 12× herbicide treatment compared to seed production by untreated plants in Z. mays and G. max.

Keywords

NicosulfuronsethoxydimSetaria faberi, Herrm. SETFA, giant foxtailZea mays L., ‘Wyffels W549’ and ‘Dekalb 404SR’, cornGlycine max (L.) Merr. ‘Dairyland DSR 250/STS’, soybeanDose responsefecunditysurvivorshipSETFA
Type
Research Article
Information
Weed Science , Volume 48 , Issue 4 , August 2000 , pp. 445 - 453
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Land Resources and Environmental Sciences Department, Montana State University, Bozeman, MT 59717-3120; [email protected]

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