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Control of Volunteer Glyphosate-Resistant Cotton in Glyphosate-Resistant Soybean

Published online by Cambridge University Press:  20 January 2017

Alan C. York ,
Alexander M. Stewart ,
P. Roy Vidrine  and
A. Stanley Culpepper
Alan C. York*
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695
Alexander M. Stewart
Affiliation:
Dean Lee Research Station, LSU Agricultural Center, 8105 Tom Bowman Dr., Alexandria, LA 71302
P. Roy Vidrine
Affiliation:
Dean Lee Research Station, LSU Agricultural Center, 8105 Tom Bowman Dr., Alexandria, LA 71302
A. Stanley Culpepper
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, P.O. Box 1209, Tifton, GA 31793
*
Corresponding author's E-mail: [email protected]
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Abstract

Cotton boll weevil has been eradicated from much of the U.S. Cotton Belt. After eradication, a containment program is necessary to detect and destroy reintroduced boll weevils. Crops other than cotton are not monitored for boll weevil, hence fruit on volunteer glyphosate-resistant (GR) cotton in GR soybean could provide oviposition sites for boll weevils and allow the insects to build up undetected. An experiment was conducted at five locations to evaluate control of GR cotton and reduction in cotton fruit production by herbicides commonly used on GR soybean. Cotton control by preemergence (PRE) or postemergence (POST) herbicides alone was inconsistent across locations. Flumetsulam at 45 g ai/ha, imazaquin at 137 g ai/ha, and metribuzin at 360 g ai/ha plus chlorimuron at 60 g ai/ha applied PRE controlled cotton 55 to 100% and reduced cotton fruit production 84 to 100%. Sulfentrazone at 167 g ai/ha plus chlorimuron at 34 g/ha PRE controlled cotton 50 to 91% and reduced fruit 48 to 98%. Metribuzin PRE at 420 g/ha controlled cotton 23 to 97% and reduced fruit 32 to 100%. Flumiclorac at 30 g ai/ha, 2,4-DB dimethylamine salt at 35 g ae/ha, chlorimuron at 12 g ai/ha, and the sodium salt of fomesafen at 420 g ai/ha mixed with glyphosate and applied POST controlled cotton 48 to 100% and reduced fruit production 67 to 100%. Cloransulam at 12 or 18 g ai/ha controlled cotton 3 to 66% and reduced fruit production 5 to 85%. Cotton control and fruit reduction were greatest and most consistent with sequential applications of metribuzin plus chlorimuron PRE followed by chlorimuron, flumiclorac, fomesafen, or 2,4-DB POST. These treatments controlled cotton at least 95% at all locations. Cotton fruit was totally eliminated at three locations and reduced at least 97% at a fourth location.

Keywords

Chlorimuroncloransulam2,4-DBflumetsulamflumicloracfomesafenglyphosatemetribuzinsulfentrazonecotton, Gossypium hirsutum L. ‘DP 422 B/RR’, ‘PM 1218 B/RR’soybean, Glycine max (L.) Merr. ‘A5353RR’, ‘A5802RR’, ‘A5901RR’Boll weevil eradicationchlorimuroncloransulamflumetsulamflumicloracfomesafenmetribuzinoviposition sitessulfentrazone2,4-DBDAP, days after plantingGR, glyphosate-resistantPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 532 - 539
Copyright
Copyright © Weed Science Society of America 

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References

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