Herbicide Inputs and Mowing Affect Vaseygrass (<i>Paspalum urvillei</i>) Control

Jeffries, Matthew D.; Gannon, Travis W.; Yelverton, Fred H.

doi:10.1614/wt-d-16-00072.1

Cited by 4 publications

(7 citation statements)

References 17 publications

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“…Vasey's grass ( Paspalum urvillei ) incurred ground cover reductions when nicosulfuron + metsulfuron methyl was applied. Jeffries et al (2017) concluded, however, that inputs across multiple years would be needed to achieve complete control.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of chemical control and seasonal application options for smutgrass (Sporobolus indicus)

Howard,

Nolte,

Hussey

et al. 2023

Weed Technol

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Smutgrass is a non-native perennial weed that is problematic because of its poor palatability to cattle and its difficulty to control once established. There is limited literature on the effectiveness of alternative labeled herbicides to hexazinone for smutgrass control and forage injury. This study aimed to evaluate seasonal applications of labeled forage herbicides for maximum smutgrass control. The second objective was to evaluate preemergent herbicides and hexazinone to control smutgrass germinating from seed. Hexazinone, nicosulfuron + metsulfuron-methyl, and glyphosate + imazapic were the most effective postemergence treatments, while quinclorac had little activity on smutgrass. Common bermudagrass forage fully recovered from all treatments by 3 months after treatment. Hexazinone, nicosulfuron + metsulfuron methyl, glyphosate, and imazapic were observed postemergence over spring, summer, and fall applications. Summer applications of hexazinone resulted in the highest level of control, while spring treatments provided the least control. Applications of hexazinone or glyphosate resulted in the most effective smutgrass control. However, fall applications resulted in the least forage injury. Results of the preemergent study indicate that treatments of indaziflam and hexazinone provide adequate control of germinating smutgrass seedlings in the greenhouse at 0.25, 0.5, and 0.75X of the lowest recommended labeled rate for seedling grass control. Indaziflam treatments prevented the emergence of any visible smutgrass seedling tissue, compared to hexazinone, which fully controlled the germinating seedlings by 21 DAT, or pendimethalin significantly reduced seedling numbers at the 0.5 and 0.75X rates.

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Section: Resultsmentioning

confidence: 99%

Evaluation of chemical control and seasonal application options for smutgrass (Sporobolus indicus)

Howard,

Nolte,

Hussey

et al. 2023

Weed Technol

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“…In addition, the seed production of P. urvillei was higher than that of the other sexual Dilatata species. Its large seed production, combined with a broader germination niche, may explain why P. urvillei has been widely reported outside its native range as a weed for summer crops and roadsides in subtropical regions [ 81 , 82 , 83 ].…”

Section: Discussionmentioning

confidence: 99%

Understanding the Geographic Patterns of Closely-Related Species of Paspalum (Poaceae) Using Distribution Modelling and Seed Germination Traits

Glison

Romero

Rosso

et al. 2023

Plants

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The sexual species of the Dilatata complex (Paspalum dasypleurum, P. flavescens, P. plurinerve, P. vacarianum, and P. urvillei) are closely related phylogenetically and show allopatric distributions, except P. urvillei. These species show microhabitat similarities and differences in germination traits. We integrated species distribution models (SDMs) and seed germination assays to determine whether germination divergences explain their biogeographic pattern. We trained SDMs in South America using species’ presence–absence data and environmental variables. Additionally, populations sampled from highly favourable areas in the SDMs of these species were grown together, and their seeds germinated at different temperatures and dormancy-breaking conditions. Differences among species in seed dormancy and germination niche breadth were tested, and linear regressions between seed dormancy and climatic variables were explored. SDMs correctly classified both the observed presences and absences. Spatial factors and anthropogenic activities were the main factors explaining these distributions. Both SDMs and germination analyses confirmed that the niche of P. urvillei was broader than the other species which showed restricted distributions, narrower germination niches, and high correlations between seed dormancy and precipitation regimes. Both approaches provided evidence about the generalist-specialist status of each species. Divergences in seed dormancy between the specialist species could explain these allopatric distributions.

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“…Results from this study suggest that C. virgata growth and seed production can be greatly suppressed if mowing along roadsides is followed by effective herbicide applications. However, its eradication from Queensland and New South Wales roadsides may require management interventions over multiple growing seasons [27].…”

Section: Discussionmentioning

confidence: 99%

“…Grazing will also help to reduce seed production. In this study, grazing was performed only once but multiple grazing events may make weeds more susceptible to herbicides [27]. Grazing or mowing may influence physiological, morphological, biological, or anatomical traits of the plant and, therefore, affect herbicide deposition patterns, absorption, or translocation in shoots [31].…”

Section: Discussionmentioning

confidence: 99%

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Integrated Management of Wild Oat (Avena fatua) and Feather Fingergrass (Chloris virgata) Using Simulated Grazing and Herbicides

Chauhan

2022

Agronomy

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Wild oat (Avena fatua L.) and feather fingergrass (Chloris virgata Sw.) are among the most problematic weed species in Australian winter and summer cropping systems, respectively. Pot trials were conducted in respective seasons to evaluate the integrated effect of simulated grazing and foliar-applied herbicides on the control of these weed species. Different herbicides were applied 1, 5, and 12 d after grazing on A. fatua plants and 1, 3, 7, 10, and 14 d after grazing on C. virgata. In general, the efficacy of herbicides was better on A. fatua when applied 5 or 12 d after grazing (i.e., 7–20 cm tall plants) and 7 to 14 d (i.e., 10–22 cm tall plants) after grazing on C. virgata. Clethodim 90 g a.i.·ha−1, and haloxyfop 52 and 78 g a.i.·ha−1 resulted in 100% mortality of A. fatua seedlings, irrespective of their application timings. Delayed application (5 or 12 d after grazing) of clethodim 60 g a.i.·ha−1 and pinoxaden 20 and 30 g a.i.·ha−1 resulted in 100% mortality of A. fatua. Glyphosate at the field rate (370 g a.e. ha−1) was the least effective herbicide to control A. fatua plants after grazing. Glufosinate application after grazing resulted in the greatest mortality (69 to 81%) of C. virgata. Depending on application timing, only glufosinate was able to provide complete control of C. virgata seed production. Butroxydim, clethodim, and haloxyfop were found to be promising herbicides to manage C. virgata after grazing but their applications had to be delayed by 7 to 14 d after grazing. This study identified several successful herbicide treatments that could be applied after grazing or mowing for integrated control of A. fatua and C. virgata. However, to achieve complete control of C. virgata, the application of these herbicides needs to be followed by other tools, including additional herbicide applications.

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Herbicide Inputs and Mowing Affect Vaseygrass (Paspalum urvillei) Control

Cited by 4 publications

References 17 publications

Evaluation of chemical control and seasonal application options for smutgrass (Sporobolus indicus)

Evaluation of chemical control and seasonal application options for smutgrass (Sporobolus indicus)

Understanding the Geographic Patterns of Closely-Related Species of Paspalum (Poaceae) Using Distribution Modelling and Seed Germination Traits

Integrated Management of Wild Oat (Avena fatua) and Feather Fingergrass (Chloris virgata) Using Simulated Grazing and Herbicides

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