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Control of Summer Annual Grasses during Seeded Zoysiagrass Establishment with Various Timings and Rates of Fluazifop, Triclopyr, and Fluazifop plus Triclopyr

  • Dustin F. Lewis (a1), Scott McElroy (a2) and Greg K. Breeden (a1)

Abstract

Summer annual grasses such as goosegrass and smooth crabgrass can hinder seeded zoysiagrass establishment. The herbicide fluazifop controls various grassy weed species but can injure mature and seedling zoysiagrass. Research has indicated that fluazifop applications can be safened on mature zoysiagrass cultivars with the addition of triclopyr. Based on these observations, research was conducted to evaluate weed control and tolerance of seeded ‘Zenith’ zoysiagrass to fluazifop (0.11 or 0.21 kg ai ha−1), triclopyr (1.12 kg ae ha−1), or fluazifop plus triclopyr (0.11 or 0.21 kg ha−1 plus 1.12 kg ha−1) applied at seeding, 14, or 28 d after emergence (DAE). All herbicide treatments applied at seeding did not hinder zoysiagrass germination but did not reduce goosegrass populations. Fluazifop alone (0.11 and 0.21 kg ha−1) applied at 14 and 28 DAE injured zoysiagrass seedlings but was reduced with the addition of triclopyr. At the end of the growing season, the greatest zoysiagrass cover was achieved by applications of fluazifop alone (0.11 kg ha−1) applied at 14 DAE or fluazifop (0.11 or 0.21 kg ha−1) plus triclopyr applied at 14 or 28 DAE. Fluazifop (0.11 or 0.21 kg ha−1) applied alone or tank-mixed with triclopyr controlled goosegrass > 70% when applied 14 and 28 DAE. Based on these data, applications of fluazifop tank-mixed with triclopyr can successfully control goosegrass without injuring Zenith zoysiagrass seedlings.

Los zacates anuales de verano como Eleusine indica y Digitaria ischaemum pueden inhibir el establecimiento de Zoysia japonica. El herbicida fluazifop controla varias especies de gramíneas pero puede dañar a Z. japonica, tanto en estado de plántula como en estado adulto. Investigaciones han indicado que las aplicaciones de fluazifop pueden ser seguras en cultivares de Z. japonica adultos con la adición de triclopyr. En base a estas observaciones, se realizó una investigación para evaluar el control de malezas y la tolerancia de la variedad ‘Zenith'de Z. japonica al fluazifop (0.11 ó 0.21 kg ia ha−1), al triclopyr (1.12 kg ea ha−1), o al fluazifop más triclopyr (0.11 ó 0.21 kg ha−1 más 1.12 kg ha−1) aplicados en la siembra, 14 ó 28 días después de la emergencia (DAE). Todos los tratamientos de herbicidas aplicados en la siembra no impidieron la germinación de Z. japonica, pero tampoco redujeron las poblaciones de E. indica. Fluazifop solo (0.11 y 0.21 kg ha−1), aplicado a los 14 ó 28 DAE, dañó las plántulas de Z. japonica pero el daño se redujo con la adición de triclopyr. Al final del ciclo de cultivo, se logró la mayor cobertura de Z. japonica con aplicaciones de fluazifop solo (0.11 ó 0.21 kg ha−1) a los 14 DAE, o fluazifop (0.11 ó 0.21 kg ha−1) más triclopyr aplicado a los 14 ó 28 DAE. Fluazifop (0.11 ó 0.21 kg ha−1) aplicado solo o mezclado con triclopyr controló E. indica > 70% cuando se aplicó a los 14 y 28 DAE. Con base en esta información, las aplicaciones de fluazifop mezclado con triclopyr pueden controlar E. indica exitosamente sin dañar las plántulas de Z. japonica variedad ‘Zenith’.

Copyright

Corresponding author

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

References

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