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Herbicide resistance in annual bluegrass on Tennessee golf courses
Author(s) -
Brosnan James T.,
Vargas Jose J.,
Breeden Gregory K.,
Zobel John M.
Publication year - 2020
Publication title -
crop, forage and turfgrass management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.29
H-Index - 10
ISSN - 2374-3832
DOI - 10.1002/cft2.20050
Subject(s) - simazine , poa annua , glyphosate , acre , biology , resistance (ecology) , agronomy , herbicide resistance , weed , weed control , horticulture , pesticide , atrazine
Research was conducted to determine the extent of herbicide resistance in annual bluegrass ( Poa annua L.) randomly collected from Tennessee golf courses during 2018. Harvested plants were cultured for seed collection, with progeny screened for resistance to glyphosate (Roundup Pro; 32 fl oz acre −1 ), foramsulfuron (Revolver; 17.4 fl oz acre −1 ), simazine (Princep 4FL; 2 qt acre −1 ), or prodiamine (Barricade 65WG; 0.001 mM). In postemergence herbicide screens, annual bluegrass collections were grouped based on survival percentage: resistant (>30% survival), segregating for resistance (5–30% survival), or susceptible (<5% survival). For prodiamine, annual bluegrass collections were screened in hydroponics and deemed resistant when <20% of plants exhibited symptoms of herbicide treatment (e.g., club roots), whereas those with >90% of plants showing symptoms were deemed susceptible; the remainder were intermediate and classified as segregating for resistance. In total, 64% of the annual bluegrass collections had some degree of resistance to glyphosate. Similarly, 21% had some degree of resistance to foramsulfuron, while 58% of annual bluegrass collections had some degree of resistance to prodiamine. Only 3% of the annual bluegrass collections were susceptible to simazine, and 25% of those surviving treatment were resistant to glyphosate or foramsulfuron. Multiple resistance to glyphosate, foramsulfuron, and simazine was reported in 4% of the annual bluegrass collections. The results of this research highlight the need for more diversified weed management strategies to control annual bluegrass on Tennessee golf courses.