Perennial ryegrass phytotoxicity increases with mesotrione rate and growth‐promoting environmental conditions

Gonçalves, Clebson Gomes; Ricker, Daniel; Askew, Shawn D.

doi:10.1002/csc2.20407

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…There was a large number of tillers in both experiments for perennial grass, which produces its highest number of tillers in early summer, while the number of tillers of annual bluegrass is considered to be highest in early autumn (Brede and Duich, 1986). As previously mentioned (McCurdy et al, 2008;Goncalves et al, 2020), it is important not to use Mes under conditions of rapid turfgrass growth, because injuries of perennial ryegrass could occur. It has been also confirmed (Kennedy, 2016) and in the present study, that Mes can act against annual bluegrass but has limited specificity.…”

Section: Discussionmentioning

confidence: 85%

Are prohexadione calcium and Pseudomonas fluorescens a solution to limit the spread of annual bluegrass (Poa annua L.) on football pitches?

Bohinc

Zanelli

Vidrih

et al. 2021

Folia Horticulturae

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In 2020, a greenhouse experiment was conducted to investigate the suppression of annual bluegrass (Poa annua), which is a difficult weed to manage in cool-season in turfgrass mixtures on football pitches. The efficacy of prohexadione calcium (Pc), ethephon (Eth) and Pseudomonas fluorescens against P. annua, Lolium perenne and Poa pratensis was tested, as the latter two most commonly occur in turfgrass mixtures on football pitches. Mesotrione (Mes) was used as a positive control, and nontreated grass was used as a negative control. Only a single grass species was sown in each pot. Treatments were randomly distributed for two experiments conducted separately: first – unmown grass before the beginning of spraying and second – grass mowed before the beginning of spraying. In both experiments, plant height and the number of tillers were measured/counted several times during the growing season. In both experiments, grasses were sprayed six times with Pc, Eth and P. fluorescens, while Mes was applied twice. Based on the performed study, the efficacy of the tested products is connected to grass species and whether the grass was mowed/cut before spraying. It has been detected in the present study that spraying with Pc could reduce the height of annual bluegrass, while spraying with P. fluorescens has reduced the number of tillers. Spraying was more effective on grasses that were mowed/cut before the beginning of spraying. Mes should cause severe damage to annual bluegrass but without confirmation in this study. Results of this study have indicated that the application of Pc and P. fluorescens can inhibit the spread of annual bluegrass in football pitches; however, testing their effectiveness against P. annua under field conditions should be performed as well.

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Section: Discussionmentioning

confidence: 85%

Are prohexadione calcium and Pseudomonas fluorescens a solution to limit the spread of annual bluegrass (Poa annua L.) on football pitches?

Bohinc

Zanelli

Vidrih

et al. 2021

Folia Horticulturae

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“…In turfgrass, mesotrione controlled crabgrass (Digitaria spp.) better when N was applied at $ 10 kg•ha À1 within 3 d of mesotrione application (Beck et al, 2015;Elmore at al., 2012).…”

Section: Methodsmentioning

confidence: 99%

Mesotrione and Amicarbazone Tank-mixtures for Annual Bluegrass (Poa annua) Control in Cool-season Turfgrass

Elmore

Patton

Thoms

et al. 2022

horts

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Annual bluegrass (Poa annua L.) control with postemergence herbicides in cool-season turfgrass is often inconsistent. Amicarbazone and mesotrione have complementary modes of action but have not been evaluated in tank-mixtures for control of mature annual bluegrass in cool-season turfgrass. Field experiments were conducted during 2018 in New Jersey, and in Indiana, Iowa, and New Jersey during 2019 to evaluate springtime applications of amicarbazone and mesotrione for POST annual bluegrass control in cool-season turfgrass. On separate tall fescue (Festuca arundinacea Schreb.) and kentucky bluegrass (Poa pratensis L.) sites in 2018, three sequential applications of amicarbazone (53 g⋅ha−1) + mesotrione at 110 to 175 g⋅ha−1 provided >70% annual bluegrass control, whereas three sequential applications of amicarbazone alone at 53 and 70 as well as two sequential applications at 110 g⋅ha−1 provided <15% control at 14 weeks after initial treatment (WAIT). In 2019, results in New Jersey were similar to 2018 where amicarbazone alone provided less control than mesotrione + amicarbazone tank-mixtures. In Indiana, where the annual bluegrass infestation was severe and most mature, tank-mixtures were more effective than amicarbazone alone at 6 WAIT, but at 12 WAIT all treatments provided poor control. In Iowa, where the annual bluegrass infestation was <1 year old, all treatments provided similar control throughout the experiment and by >80% at the conclusion of the experiment. This research demonstrates that sequential applications of mesotrione + amicarbazone can provide more annual bluegrass control than either herbicide alone, but efficacy is inconsistent across locations, possibly due to annual bluegrass maturity and infestation severity.

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“…Because of mesotrione's soil activity, its applications are less dependent on leaf moisture for absorption. Although mesotrione is not dependent on leaf moisture for absorption, relative humidity will influence and increase turfgrass injury (Goddard et al 2010;Gonçalves et al 2021). Goddard et al (2007) reported that dew presence at the time of application did not influence the control of dandelion or white clover by combination granules of mesotrione plus fertilizer in contrast to a dew-dependent granular product containing 2,4-D and MCPP.…”

Section: Introductionmentioning

confidence: 99%

Simulated controlled-release mesotrione for turfgrass tolerance and weed control

Goddard¹,

Gonçalves

Askew

2021

Weed Technol

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Mesotrione typically requires multiple applications to control emerged weeds in turfgrass. Since it is absorbed by both foliage and roots, a controlled-release (CR) formulation could eliminate the need for multiple applications. Research was conducted evaluate simulated-release scenarios that mimic a potential CR mesotrione formulation. A soluble concentrate formulation of mesotrione was titrated to produce a stepwise change in mesotrione rates, which were applied daily to mimic predetermined release scenarios over a three-wk period. CR scenarios were compared to a broadcast treatment of mesotrione at 280 g ai ha-1 applied twice at three-wk intervals, and a nontreated. Mesotrione applied in three temporal release scenarios controlled creeping bentgrass, goosegrass, nimblewill, smooth crabgrass, and white clover equivalent to the standard sprayed mesotrione treatment in every comparison. However, each CR scenario injured tall fescue 2 to 7 times more than the standard treatment. Soil- and foliar-initiated repeat treatments were equivalent in most comparisons. Data indicates that mesotrione applied in a temporal range to simulate controlled release scenarios can deliver desired weed control efficacy comparable to sequential broadcast applications. More research is needed to elucidate proper timings and release scenarios to minimize turfgrass injury.

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Perennial ryegrass phytotoxicity increases with mesotrione rate and growth‐promoting environmental conditions

Cited by 3 publications

References 48 publications

Are prohexadione calcium and Pseudomonas fluorescens a solution to limit the spread of annual bluegrass (Poa annua L.) on football pitches?

Are prohexadione calcium and Pseudomonas fluorescens a solution to limit the spread of annual bluegrass (Poa annua L.) on football pitches?

Mesotrione and Amicarbazone Tank-mixtures for Annual Bluegrass (Poa annua) Control in Cool-season Turfgrass

Simulated controlled-release mesotrione for turfgrass tolerance and weed control

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