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Secale cereale interference and economic thresholds in winter Triticum aestivum

Published online by Cambridge University Press:  20 January 2017

Todd A. Pester ,
Philip Westra ,
Randy L. Anderson ,
Drew J. Lyon ,
Stephen D. Miller ,
Phillip W. Stahlman ,
Francis E. Northam  and
Gail A. Wicks
Philip Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Randy L. Anderson
Affiliation:
Central Great Plains Research Station, USDA-ARS, Akron, CO 80720
Drew J. Lyon
Affiliation:
Panhandle Research and Extension Center, University of Nebraska–Lincoln, Scottsbluff, NE 69361
Stephen D. Miller
Affiliation:
Department of Plant Sciences, University of Wyoming, Laramie, WY 82071
Phillip W. Stahlman
Affiliation:
Agricultural Research Center–Hays, Kansas State University, Hays, KS 67601
Francis E. Northam
Affiliation:
Agricultural Research Center–Hays, Kansas State University, Hays, KS 67601
Gail A. Wicks
Affiliation:
West Central Research and Extension Center, University of Nebraska–Lincoln, North Platte, NE 69101
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Abstract

Secale cereale is a serious weed problem in winter Triticum aestivum–producing regions. The interference relationships and economic thresholds of S. cereale in winter T. aestivum in Colorado, Kansas, Nebraska, and Wyoming were determined over 4 yr. Winter T. aestivum density was held constant at recommended planting densities for each site. Target S. cereale densities were 0, 5, 10, 25, 50, or 100 plants m−2. Secale cereale–winter T. aestivum interference relationships across locations and years were determined using a negative hyperbolic yield loss function. Two parameters—I, which represents the percent yield loss as S. cereale density approaches zero, and A, the maximum percent yield loss as S. cereale density increases—were estimated for each data set using nonlinear regression. Parameter I was more stable among years within locations than among locations within years, whereas maximum percentage yield loss was more stable across locations and years. Environmental conditions appeared to have a role in the stability of these relationships. Parameter estimates for I and A were incorporated into a second model to determine economic thresholds. On average, threshold values were between 4 and 5 S. cereale plants m−2; however, the large variation in these threshold values signifies considerable risk in making economic weed management decisions based upon these values.

Keywords

Secale cereale L. SECCE, ryeTriticum aestivum L., wheatCrop–weed competitiondecision aidsferal ryewinter wheatyield loss model
Type
Research Article
Information
Weed Science , Volume 48 , Issue 6 , December 2000 , pp. 720 - 727
Copyright
Copyright © Weed Science Society of America 

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