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Winter Wheat Response to Preplant Applications of Aminocyclopyrachlor

  • Andrew R. Kniss (a1) and Drew J. Lyon (a2)
Abstract

Field studies were conducted in Wyoming and Nebraska in 2007 through 2009 to evaluate winter wheat response to aminocyclopyrachlor. Aminocyclopyrachlor was applied at rates between 15 and 120 g ai ha−1 6, 4, and 2 mo before winter wheat planting (MBP). Redroot pigweed control was 90% with aminocyclopyrachlor rates of 111 and 50 g ha−1 when applied 4 or 2 MBP. Aminocyclopyrachlor at 37 g ha−1 controlled Russian thistle 90% when applied 6 MBP. At Sidney, NE, winter wheat yield loss was > 10% at all aminocyclopyrachlor rates when applied 2 or 4 MBP, and at all rates > 15 g ha−1 when applied 6 MBP. At Lingle, WY, > 40% winter wheat yield loss was observed at all rates when averaged over application timings. Although the maturing wheat plants looked normal, few seed were produced in the aminocyclopyrachlor treatments, and therefore preharvest wheat injury ratings of only 5% corresponded to yield losses ranging from 23 to 90%, depending on location. The high potential for winter wheat crop injury will almost certainly preclude the use of aminocyclopyrachlor in the fallow period immediately preceding winter wheat.

Se llevaron a cabo estudios de campo en Wyoming y Nebraska de 2007 hasta 2009, para evaluar la respuesta del trigo de invierno al aminocyclopyrachlor. Este herbicida fue aplicado a dosis entre 15 y 120 g ia ha−1 a los 6, 4, y 2 meses antes de la siembra del trigo (MBP). El control de Amaranthus retroflexus fue del 90% con dosis de 111 y 50 g ha−1 de aminocyclopyrachlor, cuando se aplicó a 4 y 2 MBP, respectivamente. El aminocyclopyrachlor aplicado a 37 g ha−1 controló Salsola tragus en un 90% cuando se aplicó 6 MBP. En Sidney, Nebraska, la pérdida de rendimiento del trigo fue >10% en respuesta a todas las dosis de aminocyclopyrachlor cuando se aplicó 2 ó 4 MBP, y a todas las dosis >15 g ha−1 cuando se aplicó 6 MBP. En Lingle, Wyoming, se observó una pérdida de rendimiento del trigo >40% en respuesta a todas las dosis, cuando se promediaron los momentos de aplicación. Aun cuando las plantas de trigo al madurar se veían normales, se produjeron pocas semillas en los tratamientos con aminocyclopyrachlor y por lo tanto, estimados visuales de daño pre-cosecha en el trigo de sólo 5% correspondieron a pérdidas de rendimiento que variaron de 23 a 90%, dependiendo del sitio. El alto potencial de daño al cultivo, seguramente impedirá el uso de aminocyclopyrachlor en el periodo de barbecho inmediatamente previo a la siembra del trigo de invierno.

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Corresponding author
Corresponding author's E-mail: akniss@uwyo.edu
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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
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