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Purple Nutsedge (Cyperus rotundus) Control with Imazaquin in Warm-Season Turfgrasses

Published online by Cambridge University Press:  12 June 2017

G. Euel Coats
Affiliation:
Dep. Plant Pathol., and Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
Roni F. Munoz
Affiliation:
Dep. Plant Pathol., and Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
Doug H. Anderson
Affiliation:
Dep. Plant Pathol., and Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
David C. Heering
Affiliation:
Dep. Plant Pathol., and Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
Jim W. Scruggs
Affiliation:
Dep. Plant Pathol., and Weed Sci., Mississippi State Univ., Mississippi State, MS 39762

Abstract

Postemergence applications of imazaquin {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} controlled higher levels of purple nutsedge (Cyperus rotundus L. # CYPRO) in common bermudagrass [Cynodon dactylon (L.) Pers.] and hybrid bermudagrass (′Tifgreen’ and ‘Tifdwarf′, C. dactylon × C. transvaalensis Burtt-Davy) than monosodium salt of methylarsonic acid (MSMA). Control was better at 560 or 840 g ai/ha of imazaquin than at lower rates. Postemergence applications of imazaquin plus 2240 g ai/ha of MSMA controlled more purple nutsedge than equivalent rates of imazaquin alone. Preemergence applications of imazaquin were not effective. Bermudagrass discoloration was observed in some experiments on turfs mowed at a height of 1.3 cm or less but usually disappeared within 2 to 3 weeks, especially when MSMA was used in combination with imazaquin. No injury was observed on bermudagrasses, zoysiagrass (Zoysia japonica Steud. ‘Meyer′), St. Augustinegrass [Stenotaphrum secundatum (Walt.) Ktze. ‘Raleigh′], and centipedegrass [Erernochloa ophiuroides (Munro) Hack.] maintained at mowing heights above 1.3 cm.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

Literature Cited

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