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Effect of Ambient Moisture on Aminocyclopyrachlor Efficacy

Published online by Cambridge University Press:  20 January 2017

Dustin F. Lewis ,
Matthew D. Jeffries ,
Harry J. Strek ,
Robert J. Richardson  and
Fred H. Yelverton
Dustin F. Lewis*
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Matthew D. Jeffries
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Harry J. Strek
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Robert J. Richardson
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Fred H. Yelverton
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: dustin.f.lewis@basf.com
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Abstract

Aminocyclopyrachlor (AMCP) is a newly developed synthetic auxin herbicide for broadleaf weed control in turfgrass systems. AMCP has been observed to undergo rapid photodecomposition in shallow water when exposed to sunlight. Most herbicide applications on golf courses occur during the morning when dew is still present on the turfgrass canopy. These conditions could result in efficacy loss if photolysis occurred while AMCP is suspended in dew droplets. Research was conducted to determine the effect of ambient moisture on AMCP efficacy. AMCP (79 and 105 g ae ha−1), aminopyralid (280 g ae ha −1), and two AMCP granular formulations (84 g ha−1) were applied to dew-covered (WET) and dew-excluded (DRY) ‘Tifway' bermudagrass plots. Herbicide treatments applied to WET plots had greater visually rated bermudagrass injury than respective treatments applied to DRY plots at 7 and 21 d after treatment (DAT), with the exception of aminopyralid at 21 DAT. Normalized difference vegetative index on turfgrass quality complemented visual ratings, indicating greater turfgrass quality reductions when applied to WET vs. DRY plots. These results indicate that AMCP applications made to dew-covered turfgrass can increase herbicidal efficacy, and no significant losses due to photodegradation were observed.

Aminocyclopyrachlor (AMCP) es un herbicida del grupo de las auxinas sintéticas recientemente desarrollado para el control de malezas de hoja ancha en sistemas de céspedes. Se ha visto que AMCP sufre una rápida fotodescomposición en aguas superficiales cuando se expone a la luz solar. La mayoría de las aplicaciones de herbicidas en campos de golf se dan durante las mañanas cuando el rocío está todavía presente sobre el dosel del césped. Estas condiciones podrían resultar en una pérdida de eficacia si ocurre fotólisis mientras AMCP se encuentra suspendido en las gotas de rocío. Se realizó una investigación para determinar el efecto de la humedad ambiental sobre la eficacia de AMCP. Se aplicó AMCP (79 y 105 g ae ha−1), aminopyralid (280 g ae ha−1), y dos formulaciones granulares de AMCP (84 g ha−1) a parcelas del césped Cynodon dactylon 'Tifway' cubiertas con rocío (WET) y sin rocío (DRY). Los herbicidas aplicados a parcelas WET tuvieron un mayor daño evaluado visualmente que los tratamientos respectivos aplicados a parcelas DRY a 7 y 21 días después del tratamiento (DAT), con la excepción de aminopyralid a 21 DAT. El índice de diferencia vegetativa normalizada de la calidad del césped complementó las evaluaciones visuales, indicando mayores reducciones en la calidad del césped cuando se aplicaron parcelas en WET vs. DRY. Estos resultados indican que las aplicaciones AMCP hechas en césped cubierto con rocío pueden incrementar la eficacia del herbicida y no se observaron pérdidas significativas debido a fotodegradación.

Keywords

Aminocyclopyrachlor, 6-amino-5-chloro-2-cyclopropyl-4-pyrimidine-carboxylic acidaminopyralid, 4-amino-3,6-dichloro-2-pyridinecarboxylic acidbermudagrass, Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt-Davy ‘Tifway'Dewherbicide lossphotolysisturf injury
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 27 , Issue 2 , June 2013 , pp. 317 - 322
Copyright
Copyright © Weed Science Society of America 

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