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Resistance of Selected Ornamental Grasses to Graminicides

Published online by Cambridge University Press:  12 June 2017

Christopher J. Catanzaro ,
Walter A. Skroch  and
James D. Burton
Christopher J. Catanzaro
Affiliation:
Dep. Hortic. Sci., N.C. State Univ., Raleigh, NC 27695–7609
Walter A. Skroch
Affiliation:
Dep. Hortic. Sci., N.C. State Univ., Raleigh, NC 27695–7609
James D. Burton
Affiliation:
Dep. Hortic. Sci., N.C. State Univ., Raleigh, NC 27695–7609
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Abstract

Greenhouse trials were conducted to evaluate graminicidal resistance of selected ornamental grasses. Blue fescue cultivars ‘Blue Glow’, ‘Sea Urchin’, ‘Spring Blue’, and ‘Superba’ were resistant to 1× (medium use rate) and 2× rates of fenoxaprop, fluazifop-P, quizalofop, and sethoxydim, whereas fountain grass, ravenna grass, and switchgrass were sensitive. Minor (<20%) visible phytotoxicity was observed on some fescues treated with the 2× rate of fluazifop-P at 14 but not at 69 days after treatment (DAT). Fountain grass, ravenna grass, and switchgrass exhibited severe (>70%) phytotoxicity from all herbicides 69 DAT. Mortality of non-fescues ranged from 55% (fountain grass) to 96% (ravenna grass).

Keywords

Fenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidfluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)-oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefountain grass, Pennisetum alopecuroides (L.) Sprengravenna grass, Erianthus ravennae (L.) Beauvswitchgrass, Panicum virgatum L. ‘Warrior’Herbicide resistancePOST grass herbicidesaryloxyphenoxypropionatecyclohexanedionefenoxapropfluazifop-PquizalofopsethoxydimErianthus ravennaeFestuca amethystinaFestuca ovina var. glaucaPanicum virgatumPennisetum alopecuroides
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 326 - 330
Copyright
Copyright © 1993 Weed Science Society of America 

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References

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