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Efficacy and Safening of Aryloxyphenoxypropionate Herbicides when Tank-Mixed with Triclopyr for Bermudagrass Control in Zoysiagrass Turf

  • D. F. Lewis (a1), J. S. Mcelroy (a2), J. C. Sorochan (a3), T. C. Mueller (a3), T. J. Samples (a3) and G. K. Breeden (a3)...

Abstract

Aryloxyphenoxypropionate (AOPP) herbicides are used to control bermudagrass contamination in various turfgrasses. Applying AOPP herbicides alone can cause unacceptable injury to zoysiagrass but injury can be reduced when tank-mixed with triclopyr. There are limited data illustrating the extent of bermudagrass control and zoysiagrass cultivar tolerance when these compounds are combined. Research was conducted to determine the efficacy of multiple AOPP herbicides applied alone and tank-mixed with triclopyr for bermudagrass control in zoysiagrass turf. Treatments include three sequential applications of cyhalofop (0.32 kg ai ha−1), fenoxaprop (0.14 kg ha−1), fluazifop (0.11 kg ha−1), or quizalofop (0.09 kg ha−1) applied alone and tank-mixed with triclopyr (1.12 kg ae ha−1) applied to ‘Tifway’ bermudagrass, and ‘Diamond’, ‘Palisades’, and ‘Zenith’ zoysiagrass. Tifway bermudagrass control ranged from 41 to 69% and digital image analysis turf coverage data ranged from 18 to 50% for AOPP herbicides applied alone. The addition of triclopyr to AOPP herbicides increased bermudagrass control (64–79%) and reduced turf coverage (8–29%). Palisades and Zenith zoysiagrass exhibited less injury (1–18%) and greater turf coverage (84–86%) when AOPP herbicides were tank-mixed with triclopyr compared to AOPP herbicides applied alone. Diamond zoysiagrass was not tolerant to any AOPP herbicides applied alone or tank-mixed with triclopyr, except for fluazifop alone (18% injury and 93% turf coverage). Visual ratings and digital image analysis turf coverage data had a strong negative correlation over all tested turfgrasses. In general, AOPP herbicides plus triclopyr will control bermudagrass greater and injure zoysiagrass less compared to AOPP herbicides applied alone; however, these mixtures can cause unacceptable injury to Diamond zoysiagrass.

Los herbicidas Aryloxyphenoxypropionate (AOPP) son usados para controlar la contaminación de Cynodon spp. Rich en varias especies de céspedes. La aplicación de únicamente herbicidas AOPP pueden causar un daño inaceptable a la Zoysia spp., pero el daño puede reducirse cuando el herbicida se aplica mezclado con triclopyr. Existe poca información que ilustre el grado de control de la Cynodon spp. Rich. y de la tolerancia del cultivar de Zoysia spp., cuando los componentes se combinan. Se llevo al cabo una investigación para determinar la eficacia de aplicaciones múltiples de sólo herbicidas AOPP y de aplicaciones de mezclas de éste con triclopyr para controlar el Cynodon spp. Rich.; en los céspedes de Zoysia spp. Los tratamientos incluyeron tres aplicaciones secuenciales de cyhalofop (0.32 kg ia ha−1), fenoxaprop (0.14 kg ha−1), fluazifop (0.11 kg ha−1), o quizalofop (0.09 kg ha−1) aplicados solos y también mezclados con triclopyr (1.12 kg ea ha−1) a un híbrido de Cynodon llamado ‘Tifway’ Cynodon. dactylon (L.) Pers. X y Cynodon transvaalensis Burtt-Davy y a las variedades ‘Palisades’ y ‘Zenith’ de Zoysia japonica Steud., así como también a la variedad ‘Diamond’ de Zoysia matrella (L.) Merr. El control de ‘Tifway’, varió de (41 a 69%) y un análisis de imagen digital de información de cobertura de céspedes varió de (18 a 50%) para los herbicidas AOPP aplicados solos. La adición de triclopyr a los herbicidas AOPP incrementó el control de la Cynodon spp. Rich de (64 a 79%) y redujo la cobertura del césped de (8 a 29%). Las variedades de Zoysia japónica: ‘Palisades’ y ‘Zenith’ mostraron menos daño, de (1a18%) y mejor cobertura de (84 a 86%) cuando los herbicidas AOPP fueron mezclados con triclopyr en comparación con las aplicaciones de únicamente herbicidas AOPP. La Zoysia matrella (L.) Merr. ‘Diamond’ ZOYMA no toleró ningún herbicida aplicado solo o mezclado con tryclopyr, excepto el fluazifop solo (18% de daño y 93% de cobertura). Evaluaciones visuales y el análisis de imágenes digitales de cobertura tuvieron una fuerte correlación negativa para todos los céspedes probados. En general, los herbicidas AOPP más triclopyr controlarían mejor la Cynodon spp. Rich.,y dañarían en menor escala la Zoysia spp. Willd., en comparación con los herbicidas AOPP aplicados por sí solos. Sin embargo, estas mezclas pueden causar un daño inaceptable a la Zoysia matrella (L.) Merr. ‘Diamond’ ZOYMA.

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Corresponding author

Corresponding author E-mail: dustin_lewis@ncsu.edu.

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