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Aminocyclopyrachlor Efficacy for Controlling Virginia Buttonweed (Diodia virginiana) and Smooth Crabgrass (Digitaria ischaemum) in Tall Fescue

Published online by Cambridge University Press:  20 January 2017

Thomas V. Reed ,
Jialin Yu  and
Patrick E. McCullough
Thomas V. Reed
Affiliation:
Crop and Soil Sciences Department, University of Georgia, Griffin, GA 30223
Jialin Yu
Affiliation:
Crop and Soil Sciences Department, University of Georgia, Griffin, GA 30223
Patrick E. McCullough*
Affiliation:
Crop and Soil Sciences Department, University of Georgia, Griffin, GA 30223
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Virginia buttonweed and smooth crabgrass are problematic weeds in tall fescue and may warrant control with herbicides at similar timings. The objectives of these field experiments were to evaluate (1) aminocyclopyrachlor rate and application regimens for controlling Virginia buttonweed and (2) the influence of growth stage on aminocyclopyrachlor efficacy for controlling smooth crabgrass. Single applications of aminocyclopyrachlor at 0.05 and 0.08 kg ai ha−1 provided poor (< 70%) and fair (70 to 79%) control of Virginia buttonweed, respectively, but sequential applications improved control to 83 to 99%. Single and sequential applications of aminocyclopyrachlor at 0.11 kg ai ha−1 provided good (80 to 89%) and excellent (> 90%) control of Virginia buttonweed, respectively. Aminocyclopyrachlor at 0.11 kg ha−1 provided fair control of smooth crabgrass at the multileaf growth stage prior to tillering but control was poor when applied at the multitiller stage. Aminocyclopyrachlor at 0.05 and 0.08 kg ha−1 provided poor control of crabgrass at both timings and were less effective than fenoxaprop at 0.10 kg ai ha−1.

Diodia virginiana y Digitaria ischaemum son malezas problemáticas en Festuca arundinacea, las cuales podrían requerir control con herbicidas en momentos similares. Los objetivos de estos experimentos de campo fueron evaluar (1) dosis y regímenes de aplicación de aminocyclopyrachlor para el control de D. virginiana y (2) la influencia del estado de desarrollo de D. ischaemum en la eficacia de aminocyclopyrachlor para el control de esta maleza. Aplicaciones simples de aminocyclopyrachlor a 0.05 y 0.08 kg ai ha−1 brindaron un control de D. virginiana pobre (<70%) y aceptable (70 a 79%), respectivamente, pero las aplicaciones secuenciales mejoraron el control hasta 83 y 99%. Aplicaciones simples y secuenciales de aminocyclopyrachlor a 0.11 kg ai ha−1 brindaron un control de D. virginiana bueno (80–89%) y excelente (>90%), respectivamente. Aminocyclopyrachlor a 0.11 kg ha−1 brindaron un control aceptable de D. ischaemum en el estado de desarrollo de múltiples hojas antes de la producción de hijuelos, pero el control fue pobre cuando se aplicó en el estado de múltiples hijuelos. Aminocyclopyrachlor a 0.05 y 0.08 kg ha−1 brindó un control pobre de D. ischaemum en ambos momentos de aplicación y fue menos efectivo que fenoxaprop a 0.10 kg ai ha−1.

Keywords

Smooth crabgrassDigitaria ischaemum (Schreb.) Schreb. ex MuhlVirginia buttonweedDiodia virginiana L.‘Titan' tall fescueFestuca arundinacea SchrebGrowth stageherbicideturfgrass
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 3 , September 2013 , pp. 488 - 491
Copyright
Copyright © Weed Science Society of America 

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