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Effect of Coapplied Glyphosate, Pyrithiobac, Pendimethalin, or S-Metolachlor on Cotton Injury, Growth, and Yield

Published online by Cambridge University Press:  20 January 2017

Daniel O. Stephenson IV ,
Jason A. Bond ,
Randall L. Landry  and
H. Matthew Edwards
Daniel O. Stephenson IV*
Affiliation:
Dean Lee Research and Extension Center, Louisiana State University Agricultural Center, 8105 Tom Bowman Drive, Alexandria, LA 71302
Jason A. Bond
Affiliation:
Delta Research and Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS 38776
Randall L. Landry
Affiliation:
Dean Lee Research and Extension Center, Louisiana State University Agricultural Center, 8105 Tom Bowman Drive, Alexandria, LA 71302
H. Matthew Edwards
Affiliation:
Delta Research and Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in Louisiana and Mississippi in 2009 and 2010 to evaluate coapplications of glyphosate, pyrithiobac, and residual herbicides on growth and yield of glyphosate-resistant cotton. Treatments were a factorial arrangement of glyphosate (0 and 860 g ae ha−1), pyrithiobac (0 and 470 g ai ha−1), and two residual herbicides (pendimethalin [1,120 g ai ha−1], S-metolachlor [1,070 g ai ha−1], and no residual herbicide). Cotton injury was greatest 3 d after treatment (DAT) and decreased at each evaluation interval until 28 DAT when pyrithiobac was coapplied with glyphosate. Cotton injury ranged from 4 to 17% through 14 DAT when pyrithiobac was applied alone (no residual herbicide) or with pendimethalin, but injury decreased to ≤ 3% after 14 DAT. Cotton injury 3 to 21 DAT following pyrithiobac plus S-metolachlor ranged from 4 to 31%, but S-metolachlor alone injured cotton 1 to 7%. When pyrithiobac was included, cotton injury following S-metolachlor was 3 to 15% greater than that following pendimethalin from 3 to 14 DAT. Pendimethalin did not reduce plant height at 21 or 42 DAT compared with treatments receiving no residual herbicide, but S-metolachlor reduced plant heights 5 and 4% at 21 and 42 DAT, respectively. Although cotton injury was severe in some cases and persisted until 21 DAT, the injury did not cause reductions in yield. This indicates the early-season cotton injury was transient, and cotton was able to recover from the injury with no observed differences in yield.

En 2009 y 2010, se realizaron estudios de campo en Louisiana y Mississippi para evaluar el efecto de co-aplicaciones de glyphosate, pyrithiobac, y herbicidas residuales sobre el crecimiento y el rendimiento del algodón con resistencia a glyphosate. Los tratamientos estuvieron en un arreglo factorial de glyphosate (0 y 860 g ae ha−1), pyrithiobac (0 y 470 g ai ha−1), y tres herbicidas residuales (pendimethalin [1,120 g ai ha−1], S-metolachlor [1,070 g ai ha−1], y sin herbicida residual). Cuando pyrithiobac fue co-aplicado con glyphosate, el mayor daño en el algodón se dio 3 días después del tratamiento (DAT) y se redujo en cada intervalo de evaluación hasta 28 DAT. Cuando se aplicó pyrithiobac solo (sin herbicida residual) o con pendimethalin, el daño en el algodón varió de 4 a 17% hasta 14 DAT, pero el daño disminuyó a ≤3% después de 14 DAT. El daño en el algodón a 3 a 21 DAT, después de la aplicación de pyrithiobac más S-metolachlor varió de 4 a 31%, pero S-metolachlor solo dañó el algodón de 1 a 7%. Cuando se incluyó pyrithiobac, el daño en el algodón después de S-metolachlor fue 3 a 15% mayor que después de pendimethalin de 2 a14 DAT. Pendimethalin no redujo la altura de las plantas a 21 ó 42 DAT al compararse con tratamientos sin herbicida residual, pero S-metolachlor redujo la altura de las plantas 5 a 4% a 21 y 42 DAT, respectivamente. Aunque el daño en el algodón fue severo en algunos casos y persistió hasta 21 DAT, el daño no causó reducciones en el rendimiento. Esto indica que el daño en el algodón temprano en la temporada de crecimiento fue transitorio, y que el algodón fue capaz de recuperarse y no mostrar diferencias en el rendimiento.

Keywords

GlyphosatependimethalinpyrithiobacS-metolachlorcotton, Gossypium hirsutum L.Cotton phytotoxicitycotton tolerancetank mixturesresidual herbicides
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 2 , June 2013 , pp. 305 - 309
Copyright
Copyright © Weed Science Society of America 

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