Herbicide resistance in annual bluegrass on Tennessee golf courses

Brosnan, James T.; Vargas, José J.; Breeden, Gregory K.; Zobel, John M.

doi:10.1002/cft2.20050

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…Common turfgrass weed management methods to control AB include chemical and cultural practices. However, chemical control options such as ethofumesate, mesotrione, and bispyribac‐sodium have limited and inconsistent efficacy for AB control in cool‐season turfgrasses, and herbicide resistance has been reported in several mode‐of‐action groups in warm‐season turfgrasses (Brosnan, Elmore et al., 2020; Brosnan, Vargas et al., 2020). Cultural practices to suppress AB are important to complement herbicide programs for integrated management.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus influences annual bluegrass competitiveness at seeding in perennial ryegrass and creeping bentgrass

McNally

Elmore

Kowalewski

et al. 2022

Agrosystems Geosci & Env

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Annual bluegrass (AB; Poa annua L.) infestation is aided by phosphorus (P), but there is no information evaluating the effect of P on AB encroachment into turfgrass at seeded establishment. We hypothesized AB seedling survival and vigor will increase with P rates, compromising establishment of desired turfgrass species.Greenhouse pot studies evaluated the effect of P application rate on AB establishment or cover when seeded with perennial ryegrass (Lolium perenne L.) or creeping bentgrass (Agrostis stolonifera L. '007'). Two experimental runs were repeated in time. In perennial ryegrass, five P rates (0, 25, 50, 100, and 200 kg P ha −1 ) and two cultivars ('Black Cat II' and 'Home Run LS') were tested in sand media (11 mg kg −1 Mehlich-3 extractable P). In creeping bentgrass, five P rates (0, 12.5, 25, 50, and 100 kg P ha −1 ), which were modified in the second run (0, 6.25, 12.5, 25, and 50 kg P ha −1 ), were tested in sand media (3 mg kg −1 Mehlich-3 extractable P). Regardless of cultivar, AB establishment in perennial ryegrass improved when P was applied and was 90% of maximum at 1.7 kg P ha −1 . In creeping bentgrass, both AB and creeping bentgrass cover increased when P was applied and AB was 90% of maximum at 12.1 kg P ha −1 . Creeping bentgrass cover was not compromised by P application rates as low as 6.25 kg ha −1 . Phosphorus enhances AB cover from seed when sown with perennial ryegrass or creeping bentgrass seed in low P soils.

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Section: Introductionmentioning

confidence: 99%

Phosphorus influences annual bluegrass competitiveness at seeding in perennial ryegrass and creeping bentgrass

McNally

Elmore

Kowalewski

et al. 2022

Agrosystems Geosci & Env

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“…If effective, FreeHand would offer turfgrass managers a mixture of two modes of action (WSSA Groups #3 and #15) to control ABG in hybrid bermudagrass, which may help mitigate widespread resistance issues within the species. A survey of ABG populations on 90 golf courses in Tennessee (representing 30% of the 297 courses in the state) revealed sizeable percentages of ABG that was resistant to glyphosate (64%), foramsulfuron (21%), prodiamine (58%), or simazine (97%) (Brosnan, Vargas, Breeden, & Zobel, 2020a). Several researchers have demonstrated that herbicide mixtures with several modes of action can be useful in managing herbicide‐resistant grassy weeds (Breeden et al., 2017; Brosnan et al., 2017; Busi, Powles, Beckie, & Renton, 2019).…”

Section: Chemical Control Of Annual Bluegrassmentioning

confidence: 99%

“…The limited efficacy of Princep compared with other EPOST herbicides may be caused by the widespread simazine resistance reported in ABG on golf courses in the southern United States (Brosnan, Breeden, Vargas, & Grier, 2015; Hutto, Coats, & Taylor, 2004; Kelly, Coats, & Luthe, 1999). In a survey of ABG resistance on Tennessee golf courses, 97% of tested ABG populations exhibited some level of resistance to simazine at 2 qt acre –1 (Brosnan et al., 2020a). However, simazine resistance had not been confirmed at the specific research sites used in these experiments.…”

Section: Annual Bluegrass Control With Freehandmentioning

confidence: 99%

Annual bluegrass control in bermudagrass using dimethenamid and pendimethalin

Carroll

Brosnan

Breeden

2021

Crop Forage & Turfgrass Mgmt

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A 2-yr field experiment was conducted at three locations across Tennessee during 2017-2018 to determine if early-postemergence (EPOST) applications of FreeHand [pendimethalin (3,4-dimethyl-2,6-control annual bluegrass (Poa annua L.)(ABG) similar to Kerb SC [pronamide (3,benzamide)] and 3,]. Across all locations and years, EPOST applications of FreeHand at 200 lb acre -1 controlled ABG by 88 to 100% 23 wk after the initial treatment, more than or equal to Kerb SC and Princep. Follow-up research was conducted in Knoxville, TN, during 2018-2019 to compare the efficacy of FreeHand applied EPOST with Pendulum AquaCap (pendimethalin) and Tower (dimethenamid) applied individually. Sequential EPOST applications of Tower controlled ABG similar to FreeHand on all ratings dates, whereas single applications of Tower resulted in less control. Annual bluegrass control efficacy with EPOST applications of Pendulum AquaCap varied over years. Over the course of eight trials, EPOST applications of FreeHand at 200 lb acre -1 controlled ABG by 88 to 100%, suggesting that it is a new option turfgrass managers can use to control ABG in bermudagrass (Cynodon spp.). CHEMICAL CONTROL OF ANNUAL BLUEGRASSAnnual bluegrass (Poa annua L.)(ABG) is a pervasive winter annual weed of managed turfgrass. Phenotypic characteristics such as the species' light green color, bunch-type growth habit, and seedhead production can disrupt visual turfgrass quality. In regions where warm-season turfgrasses such as bermudagrass (Cynodon spp.) are maintained, ABG can be particularly problematic during periods of dormancy when

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“…Recently, there have been reports of multiple-resistant P. annua : two populations collected from golf courses in Texas exhibited multiple resistance to photosystem II (PSII) inhibitors, acetolactate synthase (ALS) inhibitors, and pronamide (Singh et al 2021). Brosnan et al (2020) reported multiple resistance to glyphosate (5-enolpyruvyl-shikimate-3-phosphate synthase [EPSPS] inhibitor), foramsulfuron, and simazine in P. annua collections from Tennessee. Three populations from golf courses in Australia exhibited multiple resistance to acetyl-CoA carboxylase (ACCase) inhibitors, ALS inhibitors, microtubule inhibitors, serine-threonine protein phosphatase inhibitors (endothall), and PSII inhibitors (Barua et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Target-site and non–target site mechanisms of pronamide resistance in annual bluegrass (Poa annua) populations from Mississippi golf courses

et al. 2023

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The mitotic-inhibiting herbicide pronamide controls susceptible annual bluegrass (Poa annua L.) pre- and post-emergence, but in some resistant populations, post-emergence activity is compromised, hypothetically due to a target-site mutation, lack of root uptake, or an unknown resistance mechanism. Three suspected pronamide-resistant (LH-R, SC-R, and SL-R) and two pronamide-susceptible (BS-S and HH-S) populations were collected from Mississippi golf courses. Dose-response experiments were conducted to confirm and quantify pronamide resistance, as well as resistance to flazasulfuron and simazine. Target-sites known to confer resistance to mitotic-inhibiting herbicides were sequenced, as were target-sites for herbicides inhibiting acetolactate synthase (ALS) and photosystem II (PSII). Pronamide absorption, and translocation was investigated following foliar and soil applications. Dose-response experiments confirmed pronamide resistance of LH-R, SC-R, and SL-R populations, as well as instances of multiple resistance to ALS and PSII inhibiting herbicides. Sequencing of the α-tubulin gene confirmed the presence of a mutation that substituted isoleucine for threonine at position 239 (Thr239-Ile) in LH-R, SC-R, SL-R, and BS-S populations. Foliar application experiments failed to identify differences in pronamide absorption and translocation between the five populations, regardless of harvest time. All populations had limited basipetal translocation—only 3–13% of the absorbed pronamide—across harvest times. Soil application experiments revealed that pronamide translocation was similar between SC-R, SL-R, and both susceptible populations across harvest times. The LH-R population translocated less soil-applied pronamide than susceptible populations, 24, 72, and 168 HAT, suggesting that reduced acropetal translocation may contribute to pronamide resistance. This study reports three new pronamide-resistant populations, two of which are resistant to two modes-of-action (MOA), and one of which is resistant to three MOA. Results suggest that both target-site- and translocation-based mechanisms may be associated with pronamide resistance. Further research is needed to confirm the link between pronamide resistance and the Thr239-Ile mutation of the α-tubulin gene.

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Herbicide resistance in annual bluegrass on Tennessee golf courses

Cited by 7 publications

References 18 publications

Phosphorus influences annual bluegrass competitiveness at seeding in perennial ryegrass and creeping bentgrass

Phosphorus influences annual bluegrass competitiveness at seeding in perennial ryegrass and creeping bentgrass

Annual bluegrass control in bermudagrass using dimethenamid and pendimethalin

Target-site and non–target site mechanisms of pronamide resistance in annual bluegrass (Poa annua) populations from Mississippi golf courses

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