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1 September 2014 Methiozolin and Cumyluron for Preemergence Annual Bluegrass ( Poa annua) Control on Creeping Bentgrass ( Agrostis stolonifera) Putting Greens
Shawn D. Askew, Brendan M. S. McNulty
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Methiozolin and cumyluron are experimental herbicides that are reported to control annual bluegrass PRE or POST; however, no studies have compared these new herbicides to currently-registered herbicides for annual bluegrass control on putting greens over multiple years. Studies were conducted on three Virginia putting greens for 2 yr to compare methiozolin and cumyluron each at two rates to bensulide and bensulide plus oxadiazon at labeled rates for effects on annual bluegrass and creeping bentgrass cover, turf injury, normalized difference vegetative index (NDVI), turf quality, and annual bluegrass seedhead suppression. Methiozolin, cumyluron, bensulide, and bensulide plus oxadiazon did not significantly injure creeping bentgrass putting green turf, reduce quality, or reduce NDVI. Only methiozolin at 500 or 750 g ai ha−1 and cumyluron at 8,600 g ai ha−1 reduced area under the progress curve (AUPC) for annual bluegrass cover following four treatments over 2 yr applied in spring and fall each year. A concomitant increase in creeping bentgrass cover AUPC was also observed from the three treatments that reduced annual bluegrass cover. Methiozolin also reduced annual bluegrass seedhead cover at least 85% 1 mo after spring treatments and more than all other treatments except cumyluron at 8,600 g ha−1 (66%). These studies suggest that single treatments of methiozolin in spring and fall will not rapidly control existing annual bluegrass but can slowly reduce populations over time, presumably by preventing new seedling emergence. Methiozolin and cumyluron appear to be more effective than currently available herbicides bensulide and bensulide plus oxadiazon for PRE annual bluegrass control and seedhead suppression on golf putting greens.

Nomenclature: Bensulide; cumyluron; methiozolin; oxadiazon; annual bluegrass, Poa annua L.; creeping bentgrass, Agrostis stolonifera L.

Methiozolin y cumyluron son herbicidas experimentales reportados para el control de Poa annua en PRE o POST. Sin embargo, ningún estudio ha comparado a lo largo de múltiples años estos nuevos herbicidas con herbicidas registrados actualmente para el control de P. annua en putting greens. Se realizaron estudios en tres putting greens en Virginia durante 2 años, para comparar los efectos de methiozolin y cumyluron, cada uno a dos dosis, con bensulide y bensulide más oxadiazon a dosis de etiqueta, sobre la cobertura de P. annua y Agrostis stolonifera, el daño en el césped, el índice de diferencia vegetativa normalizada (NDVI), la calidad del césped, y la supresión de inflorescencias de P. annua. Methiozolin, cumyluron, bensulide, y bensulide más oxadiazon no dañaron significativamente los putting greens del césped A. stolonifera, ni redujeron la calidad o NDVI. Solamente methiozolin a 500 ó 750 g ai ha−1 y cumyluron a 8,600 g ai ha−1 redujeron el área de progreso de la curva (AUPC) para la cobertura de P. annua después de cuatro tratamientos a lo largo de 2 años, aplicados en la primavera y el otoño, cada año. Se observó un crecimiento concomitante en la cobertura AIPC del césped A. stolonifera para los tres tratamientos que redujeron la cobertura de P. annua. Methiozolin también redujo la cobertura de inflorescencias de P. annua al menos 85% 1 mes después de los tratamientos y más que todos los demás tratamiento excepto cumyluron a 8,600 g ha−1

Shawn D. Askew and Brendan M. S. McNulty "Methiozolin and Cumyluron for Preemergence Annual Bluegrass ( Poa annua) Control on Creeping Bentgrass ( Agrostis stolonifera) Putting Greens," Weed Technology 28(3), 535-542, (1 September 2014).
Received: 25 February 2014; Accepted: 1 April 2014; Published: 1 September 2014
seedhead suppression
turfgrass quality
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