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9 November 2020 Response of seashore paspalum and bermudagrass to topramezone and triclopyr mixtures
Clebson G. Gonçalves, Austin M. Brown, Suma Basak, J. Scott McElroy
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Abstract

Few options are available for controlling bermudagrass invasion of seashore paspalum. Bermudagrass and seashore paspalum tolerance to topramezone, triclopyr, or the combination of these two herbicides were evaluated in both greenhouse and field conditions. Field treatments included two sequential applications of topramezone (15.6 g ai ha-1) alone and five rates of topramezone + triclopyr (15.6 + 43.2, 15.6 + 86.3, 15.6 + 172.6, 15.6 + 345.2, or 15.6 g ai ha-1 + 690.4 g ae ha-1). Secondary greenhouse treatments included a single application of topramezone (20.8 g ha-1) or triclopyr (258.9 g ha-1) alone, or in combination at 20.8 + 258.9 or 20.8 + 517.8 g ha-1, respectively. Greenhouse and field results showed that topramezone applications in combination with triclopyr present opposite responses between bermudagrass and seashore paspalum. Topramezone increased bermudagrass injury and decreased seashore paspalum bleaching injury compared to topramezone alone. In field evaluations, topramezone + triclopyr at 15.6 + 690.4 g ha-1 used in sequential applications resulted in >90% injury to bermudagrass, however, injury decreased over time. Furthermore, sequential applications of topramezone + triclopyr at 15.6 + 690.4 g ha-1 resulted in >50% injury to seashore paspalum. Application programs including topramezone plus triclopyr should increase bermudagrass suppression and reduce seashore paspalum injury compared to topramezone alone. However, additional studies are needed because such practices will likely require manipulation of topramezone rate, application timing, application interval, and number of applications in order to maximize bermudagrass control and minimize seashore paspalum injury.

Nomenclature: Topramezone; triclopyr; bermudagrass; Cynodon spp.; seashore paspalum; Paspalum vaginatum Sw

© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America.
Clebson G. Gonçalves, Austin M. Brown, Suma Basak, and J. Scott McElroy "Response of seashore paspalum and bermudagrass to topramezone and triclopyr mixtures," Weed Technology 35(3), 501-508, (9 November 2020). https://doi.org/10.1017/wet.2020.127
Received: 23 June 2020; Accepted: 4 November 2020; Published: 9 November 2020
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Efficacy
injury
mixture
synergist
turfgrass
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