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Spring Wheat Tolerance to DE-750 Applications at Different Growth Stages

Published online by Cambridge University Press:  20 January 2017

M.I. Leaden ,
C.M. Lozano ,
M.G. Monterubbianesi  and
E.V. Abello
M.I. Leaden*
Affiliation:
Departamento de Producción Vegetal, Suelos e Ingeniería Rural y Departamento de Introducción a las Ciencias Agrarias, Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, C.C. 276, 7620 Balcarce, Argentina
C.M. Lozano
Affiliation:
55 No. 1146, 7620 Balcarce, Argentina
M.G. Monterubbianesi
Affiliation:
Departamento de Producción Vegetal, Suelos e Ingeniería Rural y Departamento de Introducción a las Ciencias Agrarias, Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, C.C. 276, 7620 Balcarce, Argentina
E.V. Abello
Affiliation:
Dow AgroSciences Argentina S.A., Av. Madero 900, 1106 Buenos Aires, Argentina
*
Corresponding author's E-mail: mileaden@balcarce.inta.gov.ar
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Abstract

Spring wheat tolerance to DE-750 applications was studied in Balcarce, Argentina, during 2002 and 2003. Rates of DE-750 evaluated were 6 and 12 g ae/ha tank-mixed either with metsulfuron at 4 g ai/ha or 2,4-D at 240 g ae/ha and applied at three different Zadoks growth stages: Zd 15/22, Zd 16/23, and Zd 32. The first two Zadoks stages corresponded to Nerson's elongated apex with two or more visible primordia and the glumes differentiation stage, respectively. Dicamba plus metsulfuron and picloram plus 2,4-D were included as comparative treatments and applied at the same growth stage. In both 2002 and 2003, Baguette 10 tolerated the DE-750 plus metsulfuron and DE-750 plus 2,4-D mixtures sprayed during the first two applications (Zd 15/22 and Zd 16/23). However, DE-750 plus metsulfuron (12 g/ha + 4 g/ha) and DE-750 plus 2,4-D (6 g/ha + 240 g/ha and 12 g/ha + 240 g/ha) sprayed during the last application (Zd 32) caused significant yield reductions in the 2002 spring season. On the other hand, picloram plus 2,4-D at the last growth stage reduced yield 39% in 2002 but did not affect yield in 2003. We suggest that an excess of precipitation after application and above-normal air temperatures during grain fill may have increased crop injury with herbicides applied at the last growth stage. In short, the effect of different DE-750 mixtures with metsulfuron or 2,4-D on wheat yield could be the result of the interactions among environmental conditions, and application timing.

Keywords

DE-7501 (4-amino-3,6-dichloropyridine-2-carboxilic acid)dicambametsulfuronpicloram2,4-D butyl esterspring wheat, Triticum aestivum L., ‘Baguette 10’Crop tolerancegrowth apexPOST herbicideswheat growth stagesyield and components
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 406 - 410
Copyright
Copyright © Weed Science Society of America 

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