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Trinexapac-Ethyl Influences Bispyribac-Sodium Absorption and Efficacy for Annual Bluegrass (Poa annua) Control in Creeping Bentgrass (Agrostis stolonifera)

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough  and
Stephen E. Hart
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223-1797
Stephen E. Hart
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8520
*
Corresponding author's E-mail: pmccull@uga.edu.
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Abstract

Bispyribac-sodium selectively controls annual bluegrass in cool-season turf but efficacy may be influenced by management practices, such as plant growth regulator use. Experiments were conducted in New Jersey to investigate efficacy and absorption of bispyribac-sodium applied with trinexapac-ethyl for annual bluegrass control and turfgrass tolerance. In laboratory experiments with annual bluegrass, creeping bentgrass, and perennial ryegrass, tank-mixing trinexapac-ethyl with 14C-bispyribac-sodium increased presumed foliar absorption of 14C-bispyribac-sodium compared with nontrinexapac-ethyl treated; absorption increased with trinexapac-ethyl rate. Differences in 14C-bispyribac-sodium absorption were not detected among emulsifiable concentration, microencapsulated concentration, and wettable powder trinexapac-ethyl formulations. In field experiments, sequential bispyribac-sodium applications controlled annual bluegrass 93%, but trinexapac-ethyl did not affect efficacy. Tank-mixing all trinexapac-ethyl formulations with bispyribac-sodium provided similar annual bluegrass control and creeping bentgrass quality compared with bispyribac-sodium alone. Applications of bispyribac-sodium reduced dollar spot cover in both years, whereas trinexapac-ethyl reduced dollar spot cover only in 2005.

El bispyribac-sodio controla selectivamente la Poa annua L. en el césped que crece durante la estación templada, pero su eficacia puede ser influenciada por las prácticas de manejo, como es el uso de un regulador de crecimiento de la planta. Se llevaron al cabo experimentos en New Jersey para investigar la eficacia y la absorción del bispyribac-sodio aplicado con trinexapac-ethyl para el control de la Poa annua L. y la tolerancia de céspedes a este compuesto. En los experimentos de laboratorio con Poa annua L., Agrostis stolonifera L. y Lolium perenne L., las mezclas de trinexapac-ethyl con 14C- bispyribac-sodio incrementaron la supuesta absorción foliar de 14C- bispyribac-sodio comparada con el tratamiento sin trinexapac-ethyl. La absorción mejoró con la dosis de trinexapac-ethyl. No se detectaron diferencias en la absorción de 14C-bispyribac-sodio entre las fórmulas de concentración emulsificable, concentrado microencapsulado y polvo humedecible de trinexapac-ethyl. En los experimentos de campo, las aplicaciones secuenciales de bispyribac-sodio controlaron la Poa annua L., en un 93% pero el trinexapac-ethyl no afectó su eficiencia. Todas las mezclas de trinexapac-ethyl con bispyribac-sodio proporcionaron un control similar de la Poa annua L.; y una calidad similar de la Agrostis stolonifera L., en comparación con la aplicación de solamente el bispyribac sodio. Las aplicaciones de bispyribac-sodio redujeron los costos por unidad en ambos años, mientras que la aplicación de trinexapac-ethyl los redujo solamente en el 2005.

Keywords

Bispyribac-sodiumannual bluegrassPoa annua L.creeping bentgrassAgrostis stolonifera L.‘L-93’‘G-2’perennial ryegrassLolium perenne L.‘Applaud’Chlorosisefficacyturfgrass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 24 , Issue 3 , September 2010 , pp. 326 - 331
Copyright
Copyright © Weed Science Society of America 

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