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Sulfonylurea Herbicides Applied during Early Establishment of Seeded Bermudagrass

Published online by Cambridge University Press:  20 January 2017

John B. Willis ,
Daniel B. Ricker  and
Shawn D. Askew
John B. Willis*
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
Daniel B. Ricker
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
Shawn D. Askew
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
*
Corresponding author's E-mail: [email protected]
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Abstract

Much research has evaluated herbicide safety on established bermudagrass turf, but information is lacking on seedling response to herbicides. Three field experiments were conducted in Blacksburg, VA, to assess turfgrass and smooth crabgrass response to selected sulfonylurea herbicides during seedling bermudagrass establishment. Herbicides injured bermudagrass 9 wk after treatment in the following order from most to least injurious: flazasulfuron = trifloxysulfuron > rimsulfuron > metsulfuron = sulfosulfuron > foramsulfuron. Herbicides applied 3 wk after seeding (WAS) were generally more injurious than when applied 1 WAS. Flazasulfuron and trifloxysulfuron-sodium controlled smooth crabgrass greater than 90% at 6 WAS, and metsulfuron and rimsulfuron suppressed smooth crabgrass 76 and 84%, respectively. Foramsulfuron, metsulfuron, and sulfosulfuron appear safe to apply 1 and 3 WAS, causing very little chlorosis and no reduction in turf cover. Rimsulfuron is injurious when applied at those timings; however, long-term cover is not reduced. Flazasulfuron and trifloxysulfuron-sodium are not safe to use 1 and 3 WAS unless weed pressure is extreme, and a delay in bermudagrass cover is acceptable.

Keywords

Flazasulfuronforamsulfuronmetsulfuronrimsulfuronsulfosulfurontrifloxysulfuron-sodiumsmooth crabgrass, Digitaria ischaemum (Schreb.) Schreb ex Muhl. DIGISbermudagrass, Cynodon dactylon (L.) Pers. ‘Riviera’Turfgrass injurywarm-season turfgrass
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 1035 - 1038
Copyright
Copyright © Weed Science Society of America 

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