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Tolerance of Six Zoysiagrass Cultivars to Aminocyclopyrachlor

Published online by Cambridge University Press:  20 January 2017

Michael L. Flessner*
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
James D. McCurdy
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
J. Scott McElroy
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
*
Corresponding author's E-mail: [email protected]

Abstract

Aminocyclopyrachlor (AMCP) is labeled for use on zoysiagrass, but some injury has been observed. Differential zoysiagrass cultivar response to herbicide treatment has been previously reported. This greenhouse study evaluated the response of ‘BK-7’, ‘Cavalier’, ‘Emerald’, ‘Empire’, ‘Meyer’, and ‘Zorro’ zoysiagrass to 0, 0.005, 0.02, 0.11, 0.52, and 2.4, 11 kg ai ha−1, AMCP. Visual estimation of percent necrosis and normalized difference vegetative index (NDVI) analysis were conducted. Based on rating dates and data types three tolerance groups were established: Cavalier, Meyer, and Zorro are the most tolerant; Emerald and Empire are intermediate; and BK-7 is the least tolerant to AMCP. All zoysiagrass cultivars had sufficient tolerance at the labeled rate. Visual and NDVI analyses were highly correlated; however, NDVI data were subject to greater standard error and pseudo R2 values.

El aminocyclopyrachlor (AMCP) se recomienda para usar en zoysia, aunque se ha observado cierto daño. En el pasado se han reportado diferentes respuestas de los cultivares de zoysia a los tratamientos del herbicida. Este estudio en invernadero evaluó la respuesta de los cultivares de este césped ‘BK-7’, ‘Cavalier’, ‘Emerald’, ‘Empire’, ‘Meyer’ y ‘Zorro’ a 0, 0.005, 0.02, 0.11, 0.52, 2.4 y 11 kg ia ha−1 de AMCP. Se analizó la estimación visual del porcentaje de necrosis y el índice normalizado de la diferencia vegetativa (NDVI). Basado en las fechas de evaluación y los tipos de datos, se establecieron tres tipos de tolerancia: Cavalier, Meyer y Zorro fueron los más tolerantes; Emerald y Empire exhibieron tolerancia intermedia y BK-7 fue el menos tolerante al AMCP. Todos los cultivares de zoysia tuvieron suficiente tolerancia a la dosis recomendada. Los análisis visuales y de NDVI fueron altamente correlacionados. Sin embargo, la información NDVI fue sujeta a mayores errores estándar y seudo valores R2.

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

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