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Weed Thresholds: The Space Component and Considerations for Herbicide Resistance

Published online by Cambridge University Press:  12 June 2017

Bruce D. Maxwell
Bruce D. Maxwell*
Affiliation:
Dep. Agron. Plant Genet., 411 Borlaug Hall, Univ. Minn., St. Paul, MN 55108
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Abstract

As an extension of weed threshold models in which crop losses are based on weed density, an alternative model for grass weeds in cereal crops is proposed that incorporates the theoretical importance of selection for herbicide resistance, initial weed population frequency, and weed seed dispersal. Simulations suggest optimum weed population levels (thresholds) for maintaining genotypes that are susceptible to control practices and which minimize crop yield reductions. Weed population frequency, in combination with dispersal and competitive traits may determine optimum weed management strategies/Model simulations indicate that understanding how agricultural practices select for “weedy” traits (e.g. herbicide resistance, competitive ability, dispersal potential) may be important in determining weed density thresholds.

Keywords

green foxtail, Setaria viridis (L.) Beauv ♯ SETVIspring wheat, Triticum aestivum L.Population modelsseed dispersal
Type
Symposium
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 205 - 212
Copyright
Copyright © 1990 by the Weed Science Society of America 

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