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Purple Nutsedge (Cyperus rotundus) Control in Bermudagrass Turf with Imazosulfuron

  • Gerald M. Henry (a1), Bradley S. Sladek (a1), Andrew J. Hephner (a1) and Tyler Cooper (a1)

Abstract

Purple nutsedge response to various rates and timings of imazosulfuron was evaluated in 2007 and 2008 in Abilene, TX. Bermudagrass phytotoxicity never exceeded 4% throughout the duration of the trial and all bermudagrass recovered within 7 d of herbicide application. Imazosulfuron (0.56 kg ai ha−1) followed by (fb) imazosulfuron 1 wk after initial treatment (WAIT), imazosulfuron at 1.12 kg ai ha−1, and trifloxysulfuron at 0.03 kg ai ha−1 exhibited 94 to 96% control 4 WAIT. Imazosulfuron (0.56 kg ai ha−1) fb imazosulfuron 2, 3, and 4 WAIT exhibited 99% control 4 WAIT. Eight weeks later (12 WAIT), imazosulfuron (0.56 kg ai ha−1) fb imazosulfuron 3 WAIT controlled purple nutsedge 91%, whereas similar control (82 to 84%) was observed with a single application of trifloxysulfuron and imazosulfuron (0.56 kg ai ha−1) fb imazosulfuron 2 and 4 WAIT. A single application of imazosulfuron at 1.12 kg ai ha−1 and sequential treatment with imazosulfuron (0.56 kg ai ha−1) on a 1-wk interval only controlled purple nutsedge 51 to 69% 12 WAIT. Timing of sequential imazosulfuron application was identified as an important component of the purple nutsedge control program. Waiting 2, 3, or 4 WAIT for sequential imazosulfuron applications, rather than 1 WAIT, increased purple nutsedge control 31 to 40% 12 WAIT. The highest level of purple nutsedge control (91%) was observed with applications of imazosulfuron (0.56 kg ai ha−1) fb imazosulfuron 3 WAIT applied during midsummer. However, control with this treatment was statistically similar to control with a single application of trifloxysulfuron (82%).

La respuesta de Cyperus rotundus a varias dosis y tiempos de aplicación de imazosulfuron fue evaluada en 2007 y 2008 en Abilene, Texas. La fitotoxicidad de Cynodon dactylon nunca excedió 4% a lo largo de la duración del estudio y se recuperó antes de 7 días después de la aplicación del herbicida. Imazosulfuron (0.56 kg ia ha−1) seguido por imazosulfuron 1 semana después del tratamiento inicial (SDTI), imazosulfuron a 1.12 kg ia ha−1 y trifloxysulfuron a 0.03 kg ia ha−1 lograron de 94 a 96% de control 4 SDTI. Imazosulfuron (0.56 kg ia ha−1), seguido por imazosulfuron 2, 3 y 4 SDTI alcanzaron 99% de control 4 SDTI. Ocho semanas más tarde (12 SDTI), imazosulfuron (0.56 kg ia ha−1) seguido por imazosulfuron 3 SDTI controlaron el C. rotundus 91%, mientras que un control similar (82 a 84%) se observó con una sola aplicación de trifloxysulfuron e imazosulfuron (0.56 kg ia ha−1) seguido por imazosulfuron 2 y 4 SDTI. Una sola aplicación de imazosulfuron a 1.12 kg ia ha−1 y tratamiento secuencial con imazosulfuron (0.56 kg ia ha−1) con 1 semana de intervalo, solamente controló C. rotundus de 51 a 69% a las 12 SDTI. El tiempo de la aplicación secuencial de imazosulfuron fue identificado como un componente importante del programa de control de C. rotundus. Esperar 2, 3 o 4 SDTI para las aplicaciones secuenciales de imazosulfuron, en lugar de 1 SDTI, incrementó el control de C. rotundus de 31 a 40% a las 12 SDTI. El mayorcontrol de C. rotundus (91%) se observó con aplicaciones de imazosulfuron (0.56 kg ia ha−1) seguido por imazosulfuron 3 SDTI, aplicado a medio verano. Sin embargo, el control con este tratamiento fue similar estadísticamente al control con una sola aplicación de trifloxysulfuron (82%).

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Corresponding author

Corresponding author's E-mail: gerald.henry@ttu.edu

References

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Purple Nutsedge (Cyperus rotundus) Control in Bermudagrass Turf with Imazosulfuron

  • Gerald M. Henry (a1), Bradley S. Sladek (a1), Andrew J. Hephner (a1) and Tyler Cooper (a1)

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