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Efficacy of Preemergence Herbicides for Controlling a Dinitroaniline-Resistant Goosegrass (Eleusine indica) in Georgia

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Jialin Yu  and
Diego Gómez de Barreda
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
Jialin Yu
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
Diego Gómez de Barreda
Affiliation:
Universitat Politècnica de València, Camino de Vera s/n, Edificio 3P, 46022 Valencia, Spain
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Goosegrass is a problematic weed in turfgrass, and overuse of dinitroaniline (dna) herbicides has resulted in evolution of resistant populations. The objectives of this research were to (1) evaluate responses of a susceptible (S) goosegrass compared to a suspected resistant (R) biotype from Griffin, GA to prodiamine, and (2) evaluate efficacy of various PRE herbicides for control. Prodiamine rates required for 50% control and 50% shoot reductions after 6 wk for R-goosegrass measured > 13.44 and 3.2 kg ai ha−1, respectively, whereas rates for the S-population measured 0.45 and < 0.42 kg ha−1, respectively. In field experiments, sequential applications of dithiopyr and prodiamine provided < 20% control of R-goosegrass over 2 yr. Single applications of dimethenamid-P at 1.68 kg ai ha−1 provided < 50% goosegrass control in 2011 but provided excellent control (≥ 90%) at 7 mo after initial treatments (MAIT) in 2012. Single and sequential applications of indaziflam provided excellent control of goosegrass in both years, and oxadiazon controlled goosegrass > 85% at 7 MAIT in 2011 and ≥ 90% in 2012. Single and sequential PRE sulfentrazone applications controlled goosegrass < 60% in 2011 but averaged 94% control in 2012. Overall, indaziflam and oxadiazon provided good (80 to 89%) to excellent control of dna-resistant goosegrass in both years, but dimethenamid and sulfentrazone were inconsistent.

Eleusine indica es una maleza problemática en céspedes, y el sobreuso de herbicidas dinitroaniline (dna) ha resultado en la evolución de poblaciones resistentes. Los objetivos de esta investigación fueron (1) evaluar la respuesta a prodiamine de un biotipo de E. indica susceptible (S) y un biotipo supuestamente resistente (R) proveniente de Griffin, GA, y (2) evaluar la eficacia de varios herbicidas PRE para su control. Las dosis de prodiamine requeridas para alcanzar 50% de control y reducciones del 50% del tejido aéreo después de 6 semanas para E. indica-R fueron >13.44 y 3.2 kg ai ha−1, respectivamente, mientras que para E. indica-S fueron 0.45 y <0.42 kg ha−1, respectivamente. En experimentos de campo, las aplicaciones secuenciales de dithiopyr y prodiamine brindaron <20% de control de E. indica-R durante 2 años. Aplicaciones de solo dimethenamid-P a 1.68 kg ai ha−1 brindaron <50% de control de E. indica en 2011, pero en 2012, brindaron control excelente (≥90%) a 7 meses del tratamiento inicial (MAIT). Aplicaciones solas y secuenciales de indaziflam brindaron un control excelente de E. indica en ambos años, y oxadiazon controló >85% a 7 MAIT en 2011 y ≥90% en 2012. Aplicaciones PRE solas y secuenciales de sulfentrazone controlaron <60% en 2011, pero promediaron 94% de control en 2012. En general, indaziflam y oxadiazon brindaron un control de bueno (80 a 89%) a excelente de E. indica resistente a dna en ambos años, mientras el control con dimethenamid y sulfentrazone fue inconsistente.

Keywords

DimethenamiddithiopyrindaziflamoxadiazonprodiaminesulfentrazonegoosegrassEleusine indica (L.) GaertnHerbicideresistanceturfweed control
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 4 , December 2013 , pp. 639 - 644
Copyright
Copyright © Weed Science Society of America 

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