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1 March 2016 Creeping Bentgrass, Perennial Ryegrass, and Tall Fescue Tolerance to Topramezone During Establishment
Christopher R. Johnston, Jialin Yu, Patrick E. McCullough
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Abstract

Topramezone controls weeds in tolerant, cool-season turfgrasses, but injury potential during establishment has received limited investigation. The objectives of this research were to evaluate the tolerance of ‘Penn A-4’ creeping bentgrass, ‘Manhattan V' perennial ryegrass, and ‘Titan' tall fescue to topramezone at 18.5, 37, or 74 g ae ha−1 during establishment. Grasses were seeded in strips in October, and treatments were applied at 0, 2, 4, or 6 wk after seeding (WAS). Perennial ryegrass and tall fescue had minimal (≤ 8%) injury from all treatments, and ground cover was greater or equal to the nontreated at all application timings. Topramezone applied 4 WAS at 37 and 74 g ha−1 injured creeping bentgrass 16 and 23% at 2 wk after treatment, respectively. However, all other topramezone rates and timings caused < 10% injury. Mesotrione at 175 g ai ha−1 injured creeping bentgrass 14 to 43% at all timings and was more injurious than topramezone. Mesotrione applied at 2, 4, or 6 WAS controlled lesser swinecress ≥ 99% at 20 WAS, whereas applications on the day of seeding provided 71% control. All topramezone treatments provided poor control (< 70%) of lesser swinecress at 20 WAS. Overall, perennial ryegrass and tall fescue are tolerant to topramezone during establishment at the rates tested. Seedling creeping bentgrass has better tolerance to topramezone from 18.5 to 74 g ha−1, than to mesotrione at 175 g ha−1 and may provide end-users an HPPD inhibitor for use during establishment.

Nomenclature: HPPD, 4-hydroxyphenylpyruvate dioxygenase; mesotrione; topramezone; creeping bentgrass, Agrostis stolonifera L. ‘Penn A-4′; perennial ryegrass, Lolium perenne L. ‘Manhattan V'; lesser swinecress, Coronopus didymus (L.) Sm.; tall fescue, Festuca arundinacea (Schreb.) S.J. Darbyshire ‘Titan'.

Topramezone controla malezas en céspedes de clima frío tolerantes, pero el potencial de daño durante el período de establecimiento ha sido investigado en forma limitada. Los objetivos de esta investigación fueron evaluar la tolerancia de Agrostis stolonifera 'Penn A-4′ , Lolium perenne 'Manhattan V', y Festuca arundinacea 'Titan' a topramezone aplicado a 18.5, 37, ó 74 g ae ha−1 durante el establecimiento. Los céspedes fueron sembrados en bandas en Octubre, y los tratamientos fueron aplicados a 0, 2, 4, ó 6 semanas después de la siembra (WAS). L. perenne y F. arundinacea sufrieron un daño mínimo (≤8%) con todos los tratamientos, y su cobertura de suelo fue mayor o igual al testigo sin tratamiento para todos los momentos de aplicación. Topramezone aplicado 4 WAS a 37 y 74 g ha−1 dañó A. stolonifera 16 y 23% a 2 semanas después del tratamiento, respectivamente. Sin embargo, todas las dosis y momentos de aplicación de topramezone causaron <10% de daño. Mesotrione a 175 g ai ha−1 dañó A. stolonifera 14 y 43% en todos los momentos de aplicación y fue más dañino que topramezone. Mesotrione aplicado a 2, 4, ó 6 WAS controló Coronopus didymus ≥99% a 20 WAS, mientras que aplicaciones el día de la siembra brindaron 71% de control. Todos los tratamientos de topramezone brindaron un control limitado (<70%) de C. didymus a 20 WAS. En general, L. perenne y F. arundinacea son tolerantes a topramezone durante el establecimiento, a las dosis evaluadas. Las plántulas de

Christopher R. Johnston, Jialin Yu, and Patrick E. McCullough "Creeping Bentgrass, Perennial Ryegrass, and Tall Fescue Tolerance to Topramezone During Establishment," Weed Technology 30(1), 36-44, (1 March 2016). https://doi.org/10.1614/WT-D-15-00072.1
Received: 22 May 2015; Accepted: 1 August 2015; Published: 1 March 2016
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HPPD inhibitor
planting
resistance
seed
turfgrass
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