Limpograss Tolerance to Herbicides Is Affected by Time of Year, but Not Regrowth Height or Fertilizer Application Timing

Lastinger, Cody A.; Sellers, Brent A.; Ferrell, Jason A.; Vendramini, J. M. B.; Silveira, Maria L.

doi:10.2134/cftm2016.04.0033

Cited by 2 publications

(4 citation statements)

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“…Considering that this rate of hexazinone resulted in 56% and 90% reduction in herbage mass in 2013 and 2014, respectively, it is unlikely that rates equal to or higher than 0.56 kg ha −1 of hexazinone can be safely applied to limpograss pastures. Our results generally agree with those of Lastinger et al (2016), who found that hexazinone at 1.12 kg ha −1 resulted in more than 50% reduction in limpograss herbage mass. Injury from hexazinone has also been observed in bahiagrass and bermudagrass; however, the injury was transient and herbage mass accumulation recovered within a 12-week period (Sellers et al 2008; Wilder et al 2011), which did not occur in this study with limpograss.…”

Section: Resultssupporting

confidence: 93%

“…Similar to other warm-season perennial grass forage species, weed interference can significantly decrease limpograss agronomic responses. However, management of weeds in limpograss pastures can be challenging compared to other grass forage species because of the limited number of herbicides that result in little or no injury to limpograss (Lastinger et al 2016). Dicamba, metsulfuron, and aminopyralid are herbicides that cause little to no injury to limpograss and provide control of many weeds (Sellers and Ferrell 2013).…”

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confidence: 99%

“…Limpograss response to 0.56 and 1.12 kg ha −1 hexazinone has been inconsistent, varying from a slight injury to complete kill (Lastinger et al 2016). Even though plant height can impact herbicide selectivity for some species (Sellers et al 2009), previous research has indicated that regrowth height has no impact on limpograss tolerance to hexazinone at 0.56 or 1.12 kgha −1 (Lastinger et al 2016). This is a major concern since hexazinone is the only product available for selective smutgrass control in perennial grass pastures.…”

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confidence: 99%

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Limpograss (Hemarthria altissima) Tolerance to Hexazinone

Lastinger

Dias²,

Sellers³

et al. 2017

Weed Technol

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Field trials were conducted in 2013 and 2014 to investigate the tolerance of limpograss to increasing rates of hexazinone. Dose-response curves were generated using linear and quadratic regression models to determine the hexazinone estimated dose (ED) required to provide 10% (ED10) and 20% (ED20) of visual injury and herbage mass reduction. The ED10and ED20for visual estimates of injury were estimated to be 0.05 and 0.14 kg ai ha-1at 60 d after treatment (DAT). Regarding forage herbage mass reduction, the ED10and ED20were estimated to be 0.07 and 0.19 kg ai ha-1in 2013, whereas in 2014, the ED10and ED20were estimated to be 0.03 and 0.06 kg ai ha-1, respectively. The significant difference in herbage mass reduction between 2013 and 2014 was likely due to rainfall patterns, which possibly promoted hexazinone leaching in 2013 and consequently, less activity. Overall, hexazinone resulted in high degrees of limpograss injury across all response variables in both years; therefore, smutgrass control in limpograss pastures with hexazinone may not be a viable option. The presence or absence of smutgrass should be considered before limpograss establishment as there is no viable herbicide to selectively remove smutgrass from limpograss swards.

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Section: Resultssupporting

confidence: 93%

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confidence: 99%

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confidence: 99%

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Limpograss (Hemarthria altissima) Tolerance to Hexazinone

Lastinger

Dias²,

Sellers³

et al. 2017

Weed Technol

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“…Stapf & C.E. Hubbard] pastures in Florida (Abe et al 2016;Lastinger et al 2016), but this herbicide cannot be applied to bahiagrass because of crop injury (Bunnell et al 2003). Furthermore, IMA can only be applied to dormant bahiagrass with <25% green foliage (Anonymous 2018).…”

Section: Greenhouse Screening Studymentioning

confidence: 99%

Cadillo (Urena lobata) control with POST herbicides

et al. 2019

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Cadillo is an invasive species in Florida pastures and natural areas. Despite its invasiveness, relatively few studies have evaluated cadillo management. Thus, the objective of this research was to determine effective POST herbicides for cadillo control in Florida. Greenhouse and field studies were conducted at the Range Cattle Research and Education Center near Ona, FL, in 2015 and 2016. In the greenhouse study, triclopyr-ester, aminopyralid, metsulfuron, 2,4-D amine, aminopyralid+metsulfuron, aminocyclopyrachlor+metsulfuron, and imazapyr+aminocyclopyrachlor+metsulfuron provided ≥80% control of cadillo 28 d after treatment (DAT). Aminocyclopyrachlor at 17 and 35 g ha–1 were the only treatments with <80% control, with 70% and 75% control, respectively. Similar results were reflected in cadillo dry biomass reduction. The herbicide treatments used in the field study were triclopyr-ester, aminopyralid, 2,4-D amine, aminocyclopyrachlor, and triclopyr+fluroxypyr. Most treatments provided excellent control in the field (≥90% control) 30 DAT, and by 60 DAT all treatments provided 100% control. Results from these studies suggest that cadillo is susceptible to many of the common POST herbicides utilized in pastures and natural areas in Florida.

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Limpograss Tolerance to Herbicides Is Affected by Time of Year, but Not Regrowth Height or Fertilizer Application Timing

Cited by 2 publications

References 11 publications

Limpograss (Hemarthria altissima) Tolerance to Hexazinone

Limpograss (Hemarthria altissima) Tolerance to Hexazinone

Cadillo (Urena lobata) control with POST herbicides

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