Confirmation and Control of Annual Bluegrass (<i>Poa annua</i>) with Resistance to Prodiamine and Glyphosate

Breeden, Shane M.; Brosnan, James T.; Mueller, Thomas C.; Breeden, Gregory K.; Horvath, Brandon J.; Senseman, Scott A.

doi:10.1614/wt-d-16-00084.1

Cited by 16 publications

(22 citation statements)

References 22 publications

(32 reference statements)

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“…Even though resistance to nine mechanisms of action has been confirmed in P. annua globally, there have only been two confirmed reports of multiple resistance, a biotype resistant to simazine and trifloxysulfuron (Brosnan et al 2015) and another resistant to prodiamine and glyphosate (Breeden et al 2017). In this study, 31 populations of P. annua from golf courses that were not being adequately controlled with herbicides were tested for herbicide resistance.…”

Section: α-Tubulin Gene Mutationsmentioning

confidence: 94%

Incidence of multiple herbicide resistance in annual bluegrass (Poa annua) across southeastern Australia

et al. 2020

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Annual bluegrass (Poa annua L.) is a problematic annual weed in established turf where the intensive use of herbicides has resulted in the evolution of herbicide resistance. In 2017, 31 populations of P. annua suspected to be resistant to herbicides commonly used to control this weed in turf were collected from golf courses across southeastern Australia to check the resistance status to different herbicide groups. All populations were found to be resistant to multiple turf herbicides. Dose–response experiments confirmed resistance to propyzamide, simazine, rimsulfuron, foramsulfuron, endothall, and pinoxaden. Levels of resistance to rimsulfuron (>56-fold), foramsulfuron (>19-fold), endothall (>7-fold), and pinoxaden (>4.3-fold) compared with the susceptible population were high, but levels of resistance to propyzamide (>2-fold) and simazine (>2-fold) were lower. Considerable variation in resistance to endothall and pinoxaden was observed among the populations of P. annua. Target-site resistance was confirmed for acetolactate synthase and acetyl-CoA carboxylase inhibitors, but not for photosystem II and microtubule assembly inhibitors. This study documented the extensive resistance to herbicides in P. annua from turf in Australia. Three of the populations investigated exhibited multiple resistance to herbicides from five mechanisms of action. The identification of multiple-resistant P. annua on several golf courses is a serious concern for turf managers.

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Section: α-Tubulin Gene Mutationsmentioning

confidence: 94%

Incidence of multiple herbicide resistance in annual bluegrass (Poa annua) across southeastern Australia

et al. 2020

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“…Annual bluegrass control data were analyzed using a nonlinear regression equation (after Breeden et al 2017): In this equation, Rate 50 represents the herbicide rate ( X ) at which 50% annual bluegrass control was achieved. Both asymptotes (bottom and top) are constrained to 0% and 100%, and K represents the slope of the best-fit line to model the response of resistant and susceptible phenotypes to increasing rates of methiozolin.…”

Section: Methodsmentioning

confidence: 99%

“…Dry biomass data were fit to an exponential decay nonlinear regression equation (after Breeden et al 2017): where Y0 and Plateau were constrained to 100 and 0, respectively, and K was the slope of the best-fit line to model the response of each phenotype to increasing rates of methiozolin ( X ). The methiozolin rate required to reduce dry biomass to 50% that of the nontreated plants (GR 50 ) was calculated using the following formula: GR 50 =ln (2)/ K .…”

Section: Methodsmentioning

confidence: 99%

“…These reports document annual bluegrass resistance to herbicides with diverse modes of action, including inhibition of microtubule formation (e.g., prodiamine), photosystem II (PSII) (e.g., simazine), acetolactate synthase (ALS) (e.g., trifloxysulfuron), and enolpyruvylshikimate-3-phosphate synthase (EPSPS) (e.g., glyphosate) (Heap 2016). Multiple resistance in annual bluegrass has recently been confirmed as well (Breeden et al 2017;Brosnan et al 2016). We hypothesized that methiozolin may provide turfgrass managers with a tool for controlling herbicideresistant annual bluegrass phenotypes, considering that it effectively controls annual bluegrass via a unique mode of action that is not thoroughly understood.…”

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confidence: 99%

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Controlling Herbicide-Resistant Annual Bluegrass (Poa annua) Phenotypes with Methiozolin

et al. 2017

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Methiozolin is an isoxazoline herbicide being investigated for selective POST annual bluegrass control in managed turfgrass. Research was conducted to evaluate methiozolin efficacy for controlling two annual bluegrass phenotypes with target-site resistance to photosystem II (PSII) or enolpyruvylshikimate-3-phosphate synthase (EPSPS)-inhibiting herbicides (i.e., glyphosate), as well as phenotypes with multiple resistance to microtubule and EPSPS or PSII and acetolactate synthase (ALS)-inhibiting herbicides. All resistant phenotypes were established in glasshouse culture along with a known herbicide-susceptible control and treated with methiozolin at 0, 125, 250, 500, 1000, 2000, 4000, or 8000 g ai ha−1. Methiozolin effectively controlled annual bluegrass with target-site resistance to inhibitors of EPSPS, PSII, as well as multiple resistance to EPSPS and microtubule inhibitors. Methiozolin rates required to reduce aboveground biomass of these resistant phenotypes 50% (GR50 values) were not significantly different from the susceptible control, ranging from 159 to 421 g ha−1. A phenotype with target-site resistance to PSII and ALS inhibitors was less sensitive to methiozolin (GR50=862 g ha−1) than a susceptible phenotype (GR50=423 g ha−1). Our findings indicate that methiozolin is an effective option for controlling select annual bluegrass phenotypes with target-site resistance to several herbicides.

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“…Continued reliance on chemical methods for controlling annual bluegrass has resulted in many populations evolving resistance to PRE and POST herbicides, particularly in regions where warm-season turfgrasses are used on golf courses, athletic fields, and lawns. Annual bluegrass populations with target-site resistance to herbicidal inhibitors of acetolactate synthase (ALS), photosystem II (PSII), microtubule assembly, and enolpyruvylshikimate-3-phosphate synthase have been documented in turfgrass systems (Heap 2019), with cases of multiple resistance and nontarget site resistance becoming more common (Breeden et al 2017;Brosnan et al 2016;Svyantek et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Nonchemical annual bluegrass (Poa annua) management in zoysiagrass via fraise mowing

et al. 2020

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Continued reliance on chemical methods for controlling annual bluegrass has resulted in many populations evolving resistance to PRE and POST herbicides, particularly in warm-season turfgrass species such as zoysiagrass. Soil seedbank management is critically important when managing herbicide-resistant weeds. Fraise mowing (also spelled fraze, frase, and fraize) is a new turfgrass cultivation practice designed to remove aboveground biomass while allowing turf to regrow vegetatively. We hypothesized that this process would remove annual bluegrass seed and therefore be a mechanical means of controlling annual bluegrass in turfgrass. Zoysiagrass field plots were fraise-mowed in June 2015 only, June 2016 only, June 2015 and June 2016, or left untreated. The fraise mower was configured to remove the uppermost 25 mm of plot surface (i.e., 15-mm verdure and 10-mm soil). Annual bluegrass infestation was quantified in April following fraise mowing via grid count. Soil cores (10.8 cm diameter) were extracted from each plot after grid count data were collected to assess effects of fraise mowing on the soil seedbank. Moreover, replicated subsamples (7.6 L) of debris generated during fraise mowing were collected to better understand weed seed content removed during the fraise mowing process. Fraise mowing in June offered a slight reduction (24%) in annual bluegrass cover the following April. Whereas 28% of the seed in fraise-mowing debris consisted of annual bluegrass, there was no difference in the quantity of annual bluegrass seed remaining in the soil seedbank among fraise-mowed and non–fraise-mowed plots. Although fraise mowing may help to temporarily reduce existing annual bluegrass infestations via mechanical removal, the frequency and depth we studied did not effectively reduce the seedbank. Fraise mowing is a useful tool for providing mechanical suppression of annual bluegrass but it is not a replacement for properly timed herbicide applications.

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Confirmation and Control of Annual Bluegrass (Poa annua) with Resistance to Prodiamine and Glyphosate

Cited by 16 publications

References 22 publications

Incidence of multiple herbicide resistance in annual bluegrass (Poa annua) across southeastern Australia

Incidence of multiple herbicide resistance in annual bluegrass (Poa annua) across southeastern Australia

Controlling Herbicide-Resistant Annual Bluegrass (Poa annua) Phenotypes with Methiozolin

Nonchemical annual bluegrass (Poa annua) management in zoysiagrass via fraise mowing

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