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1 August 2015 The Addition of Dicamba to POST Applications of Quizalofop-p-ethyl or Clethodim Antagonizes Volunteer Glyphosate-Resistant Corn Control in Dicamba-Resistant Soybean
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Abstract

Two studies consisting of six field experiments each were conducted at three locations in southwestern Ontario, Canada, in 2014 and 2015 to evaluate the possible antagonism when dicamba was added to quizalofop-p-ethyl or clethodim for the control of volunteer glyphosate-resistant (GR) corn. At 4 wk after application (WAA), quizalofop-p-ethyl at 24, 30, or 36 g ai ha−1 provided 88, 94, and 95% control of volunteer GR corn, respectively. The addition of dicamba at 300 or 600 g ae ha−1 to quizalofop-p-ethyl (24 g ha−1) reduced the activity of quizalofop-p-ethyl on volunteer GR corn by 12 and 20%. At 4 WAA, clethodim at 30, 37.5, and 45 g ai ha−1 provided 85, 91, and 95% control of volunteer GR corn, respectively. The addition of dicamba at 300 or 600 g ha−1 to clethodim (30 g ha−1) resulted in antagonism, causing a reduction in volunteer GR corn by 12 and 11%, respectively. In general, there was greater antagonism when the high rate of dicamba was tank-mixed with the lower rate of the graminicide. There was no antagonistic effect on soybean yield by tank-mixing dicamba with either graminicide at all rates evaluated. Based on these results, volunteer GR corn can be controlled effectively by increasing the rate of the graminicide when tankmixed with dicamba.

Nomenclature: Clethodim; dicamba; quizalofop-p-ethyl; volunteer corn, Zea mays L.; soybean, Glycine max (L.) Merr.

Dos estudios que consistieron de seis experimentos de campo cada uno fueron realizados en tres localidades en el suroeste de Ontario, Canada, en 2014 y 2015, para evaluar el posible antagonismo cuando se agrega dicamba a quizalofop-p-ethyl o clethodim para el control de maíz resistente a glyphosate (GR) voluntario. A 4 semanas después de la aplicación (WAA), quizalofop-p-ethyl a 24, 30, ó 36 g ai ha−1 brindó 88, 94, y 95% de control de maíz GR voluntario, respectivamente. La adición de 300 ó 600 g ae ha−1 dicamba a quizalofop-p-ethyl (24 g ha−1) redujo la actividad de quizalofop-p-ethyl en maíz GR voluntario en 12 y 20%. A 4 WAA, clethodim a 30, 37.5, y 45 g ai ha−1 brindó 85, 91, y 95% de control de maíz GR voluntario, respectivamente. La adición de 300 ó 600 g ha−1 dicamba a clethodim (30 g ha−1) resultó en antagonismo, el cual causó una reducción en el control de maíz GR voluntario de 12 y 11%. En general, hubo un mayor antagonismo cuando se mezcló en tanque la dosis alta de dicamba con la dosis baja del graminicida. No hubo ningún efecto antagónico sobre el rendimiento de la soja al mezclar en tanque dicamba con cualquiera de los dos graminicidas a las dosis evaluadas. Con base en estos resultados, el maíz GR voluntario puede ser controlado efectivamente al incrementar la dosis del graminicida en la mezcla en tanque.

Matthew G. Underwood, Nader Soltani, David C. Hooker, Darren E. Robinson, Joseph P. Vink, Clarence J. Swanton, and Peter H. Sikkema "The Addition of Dicamba to POST Applications of Quizalofop-p-ethyl or Clethodim Antagonizes Volunteer Glyphosate-Resistant Corn Control in Dicamba-Resistant Soybean," Weed Technology 30(3), 639-647, (1 August 2015). https://doi.org/10.1614/WT-D-16-00016.1
Received: 2 February 2016; Accepted: 1 April 2016; Published: 1 August 2015
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