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Response of 110 Kentucky Bluegrass Varieties and Winter Annual Weeds to Methiozolin

Published online by Cambridge University Press:  23 February 2017

Sandeep S. Rana  and
Shawn D. Askew
Sandeep S. Rana
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24061
Shawn D. Askew*
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24061
*
Corresponding author's E-mail: saskew@vt.edu
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Abstract

Methiozolin is a new isoxazoline herbicide that has scarcely been tested in Kentucky bluegrass turf. A field trial was conducted in Blacksburg, VA, to determine response of 110 Kentucky bluegrass varieties and winter annual weeds to sequential fall applications of methiozolin. At 1.5 and 6 mo after initial treatment (MAIT), Kentucky bluegrass injury I30 values (predicted methiozolin rate that causes 30% Kentucky bluegrass injury) ranged between 3.4 to more than 10 times the recommended methiozolin rate for annual bluegrass control. Methiozolin at all rates reduced cover of annual bluegrass, common chickweed, corn speedwell, hairy bittercress, mouseear chickweed, and Persian speedwell but increased cover of parsley-piert. For all varieties, methiozolin at 2 kg ai ha−1 increased Kentucky bluegrass cover, turf quality, and turf normalized difference vegetation index (NDVI) relative to the nontreated check at 6 MAIT. Kentucky bluegrass relative cover change (RCC) was attributed primarily to weed control but was inversely correlated with methiozolin rates because of increased weed control and reduced Kentucky bluegrass growth. Despite the decline in RCC with increasing methiozolin rates, most Kentucky bluegrass varieties treated with the highest methiozolin rate (6 kg ha−1) still had greater Kentucky bluegrass cover than the nontreated check at 6 MAIT. Results from this study indicate that two fall applications of methiozolin at rates beyond that previously reported for annual bluegrass control can safely be applied to a broad range of Kentucky bluegrass varieties spanning most of the known genetic classifications.

Methiozolin es una herbicida isoxazoline nuevo que ha sido escasamente evaluado en el césped Kentucky Bluegrass. Se realizó un estudio de campo en Blacksburg, Virginia para determinar la respuesta de 110 variedades de Kentucky bluegrass y malezas anuales de invierno a aplicaciones secuenciales de methiozolin durante el otoño. A 1.5 y 6 meses después del tratamiento inicial (MAIT), los valores de I30 de daño en Kentucky bluegrass (dosis predicha de methiozolin que causa 30% de daño en Kentucky bluegrass) variaron entre 3.4 y más de 10 veces la dosis recomendada de methiozolin para el control de Poa anua. Todas las dosis de methiozolin redujeron la cobertura de P. annua, Stellaria media, Veronica arvensis, Cardamine hirsuta, Cerastium fontanum, y Veronica persica, pero incrementaron la cobertura de Aphanes arvensis. Para todas las variedades, methiozolin a 2 kg ai ha−1 aumentó la cobertura, la calidad del césped, el índice normalizado de la diferencia en la vegetación del césped (NDVI) de Kentucky bluegrass, en relación al testigo sin tratamiento a 6 MAIT. El cambio relativo en la cobertura (RCC) de Kentucky bluegrass fue atribuido primeramente al control de malezas pero estuvo inversamente correlacionado con las dosis de methiozolin porque se incrementó el control de malezas y se redujo el crecimiento de Kentucky bluegrass. A pesar de la disminución en RCC con el aumento de las dosis de methiozolin, la mayoría de las variedades de Kentucky bluegrass tratadas con la dosis más alta de methiozolin (6 kg ha−1) tuvieron una mayor cobertura de Kentucky bluegrass que el testigo sin tratamiento a 6 MAIT. Los resultados de este estudio indican que dos aplicaciones de methiozolin en el otoño a dosis más allá de las reportadas previamente para el control de P. annua pueden ser aplicadas en forma segura a un amplio rango de variedades de Kentucky bluegrass cubriendo la mayoría de las clasificaciones genéticas conocidas.

Keywords

Methiozolin, 5-(2,6-difluorobenzyl)oxymethyl-5-methyl-3-(3-methylthiophen-2-yl)-1,2-isoxazoline, code names: EK-5229, SJK-03, and MRC-01annual bluegrass, Poa annua L.common chickweed, Stellaria media (L.) Vill.corn speedwell, Veronica arvensis L.hairy bittercress, Cardamine hirsuta L.mouseear chickweed, Cerastium fontanum ssp. vulgare (Hartman) Greuter & Burdetparsley-piert, Aphanes arvensis L.Persian speedwell, Veronica persica Poir.creeping bentgrass, Agrostis stolonifera L.Kentucky bluegrass, Poa pratensis L.Annual bluegrass controlI30Kentucky bluegrass genetic classificationKentucky bluegrass variety classificationNDVIturfgrass injuryturfgrass qualitywinter annual weeds
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 4 , December 2016 , pp. 965 - 978
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate editor for this paper: Patrick E. McCullough, University of Georgia.

References

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