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Mesotrione, Topramezone, and Amicarbazone Combinations for Postemergence Annual Bluegrass (Poa annua) Control

Published online by Cambridge University Press:  20 January 2017

Matthew T. Elmore*
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciences Bldg., 2431 Joe Johnson Dr., Knoxville, TN 37996
James T. Brosnan
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciences Bldg., 2431 Joe Johnson Dr., Knoxville, TN 37996
Gregory K. Breeden
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciences Bldg., 2431 Joe Johnson Dr., Knoxville, TN 37996
Aaron J. Patton
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, IN 47907
*
Corresponding author's E-mail: melmore6@utk.edu

Abstract

Selective annual bluegrass (ABG) control with mesotrione is often inconsistent, and sequential applications might be required for complete control. The complementary nature of p-hydroxyphenylpyruvate dioxygenase (HPPD)- and photosystem II (PSII)-inhibiting herbicides is well documented. The HPPD-inhibiting herbicide mesotrione and the PSII-inhibiting herbicide amicarbazone both have efficacy against annual bluegrass and safety on certain cool-season turfgrasses. Topramezone is a HPPD-inhibiting herbicide being investigated for use in turfgrass. Field and greenhouse experiments were conducted to examine single applications of topramezone and mesotrione alone or in combination with amicarbazone for POST ABG control in spring. In greenhouse experiments, the combination of mesotrione (280 g ai ha−1) and amicarbazone (75 g ai ha−1) controlled ABG 70% by 21 d after treatment, > 29% more than either herbicide applied alone; these combinations were determined to be synergistic. Amicarbazone combined with topramezone (14.5 g ai ha−1) provided < 10% ABG control and was not synergistic. When combined with mesotrione, increasing amicarbazone rate to 150 or 255 g ha−1 did not increase ABG control compared to 75 g ha−1in field experiments. Combining mesotrione with amicarbazone resulted in a synergistic increase in POST ABG control at 1 and 2 wk after treatment (WAT). When applied alone or in combination with amicarbazone, increasing the mesotrione rate from 90 to 280 g ha−1 increased efficacy on ABG in field experiments. The combination of mesotrione at 280 g ha−1 and amicarbazone at 75 g ha−1 provided > 90% ABG control in field experiments. Future research should focus on sequential applications of mesotrione–amicarbazone combinations for ABG control in locations where ABG is historically more difficult to control.

El control selectivo de Poa annua (ABG) con mesotrione es frecuentemente inconsistente, y aplicaciones secuenciales podrían ser requeridas para alcanzar un control completo. La naturaleza complementaria de los herbicidas inhibidores de p-hydroxyphenylpyruvate dioxygenase (HPPD)- y del fotosistema II (PSII) está bien documentada. El herbicida mesotrione, inhibidor de HPPD, y amicarbazone, inhibidor de PSII, son efectivos contra ABG y son seguros en varios céspedes de clima frío. Topramezone es un herbicida inhibidor de HPPD que está siendo investigado para su uso en céspedes. Se realizaron experimentos de campo y de invernadero para examinar aplicaciones simples de topramezone y de mesotrione solos y en combinación con amicarbazone para el control POST de ABG en la primavera. En los experimentos de invernadero, la combinación de mesotrione (280 g ai ha−1) y amicarbazone (75 g ai ha−1) controlaron ABG 70% a 21 días después del tratamiento, >29% más que cualquiera de estos herbicidas aplicados solos; estas combinaciones fueron consideradas sinérgicas. La combinación de amicarbazone con topramezone (14.5 g ai ha−1) brindó <10% de control de ABG y no fue sinérgica. Cuando se combinó con mesotrione, el incrementar la dosis de amicarbazone a 150 ó 255 g ha−1 no incrementó el control de ABG al compararse con 75 g ha−1 en los experimentos de campo. El combinar mesotrione con amicarbazone resultó en un aumento sinérgico en el control POST de ABG a 1 y 2 semanas después del tratamiento (WAT). Cuando se aplicó amicarbazone solo o en combinación, el aumentar la dosis de mesotrione de 90 a 280 g ha−1 incrementó la eficacia sobre ABG en los experimentos de campo. La combinación de mesotrione a 280 g ha−1 con amicarbazone a 75 g ha−1 brindó >90% de control de ABG en los experimentos de campo. Investigaciones futuras deberían enfocarse en aplicaciones secuenciales de combinaciones de mesotrione-amicarbazone para el control en sitios donde históricamente ABG ha sido más difícil de controlar.

Type
Weed Management—Other Crops/Areas
Copyright
Copyright © Weed Science Society of America 

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