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Resistance of Selected Ornamental Grasses to Graminicides

Published online by Cambridge University Press:  12 June 2017

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

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).

Type
Research
Copyright
Copyright © 1993 Weed Science Society of America 

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