Neve, Paul, Norsworthy, J. K. (Jason K.), Smith, K. L. (Kenneth L.) and Zelaya, Ian A.. (2011) Modeling glyphosate resistance management strategies for Palmer Amaranth (Amaranthus palmeri) in cotton. Weed Technology, Vol.25 (No.3). pp. 335-343. ISSN 0890-037X

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Abstract

A simulation model is used to explore management options to mitigate risks of glyphosate resistance evolution in Palmer amaranth in glyphosate-resistant cotton in the southern United States. Our first analysis compares risks of glyphosate resistance evolution for seven weed-management strategies in continuous glyphosate-resistant cotton monoculture. In the "worst-case scenario'' with five applications of glyphosate each year and no other herbicides applied, evolution of glyphosate resistance was predicted in 74% of simulated populations. In other strategies, glyphosate was applied with various combinations of preplant, PRE, and POST residual herbicides. The most effective strategy included four glyphosate applications with a preplant fomesafen application, and POST tank mixtures of glyphosate plus S-metolachlor followed by glyphosate plus flumioxazin. This strategy reduced the resistance risk to 12% of populations. A second series of simulations compared strategies where glyphosate-resistant cotton was grown in one-to-one rotations with corn or cotton with other herbicide resistance traits. In general, crop rotation reduced risks of resistance by approximately 50% and delayed the evolution of resistance by 2 to 3 yr. These analyses demonstrate that risks of glyphosate resistance evolution in Palmer amaranth can be reduced by reducing glyphosate use within and among years, controlling populations with diverse herbicide modes of action, and ensuring that population size is kept low. However, no strategy completely eliminated the risk of glyphosate resistance.

Item Type:	Journal Article
Subjects:	Q Science > QK Botany S Agriculture > SB Plant culture
Divisions:	Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH):	Amaranths -- Control -- Simulation methods, Cotton -- Weed control -- Simulation methods, Herbicide resistance, Glyphosate
Journal or Publication Title:	Weed Technology
Publisher:	Weed Science Society of America
ISSN:	0890-037X
Date:	July 2011
Volume:	Vol.25
Number:	No.3
Number of Pages:	9
Page Range:	pp. 335-343
Identification Number:	10.1614/WT-D-10-00171.1
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/38514

Data sourced from Thomson Reuters' Web of Knowledge

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