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Turf Tolerance and Virginia Buttonweed (Diodia virginiana) Control with Fluroxypyr as Influenced by the Synergist Diflufenzopyr

Published online by Cambridge University Press:  20 January 2017

Hanwen Ni ,
Glenn Wehtje ,
Robert H. Walker ,
Jason L. Belcher  and
Eugene K. Blythe
Hanwen Ni
Affiliation:
Beijing Agricultural University
Glenn Wehtje
Affiliation:
Agronomy and Soils Department
Robert H. Walker*
Affiliation:
Agronomy and Soils Department
Jason L. Belcher
Affiliation:
Agronomy and Soils Department
Eugene K. Blythe
Affiliation:
Horticulture Department, Auburn University, Auburn University, AL 36849-5412
*
Corresponding author's E-mail: walkerh@auburn.edu
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Abstract

Virginia buttonweed control in warm-season turfgrass species requires high application rates and/or repeated applications of herbicides (or both) with an auxin-type mode of action. These treatments often lead to unacceptable turfgrass injury. Diflufenzopyr functions as a synergist with auxin-type herbicides, and it has been suggested that it may do the same when combined with pyridine herbicides such as fluroxypyr. The objective of this field and laboratory research was to determine whether Virginia buttonweed control could be improved with admixtures of fluroxypyr and diflufenzopyr without unacceptable turf injury. Treatments consisted of fluroxypyr applied alone at 140 and 280 g ae/ha, diflufenzopyr alone at 70 and 140 g/ha, and all possible two-way admixtures. Treatments were applied to a hybrid bluegrass ‘Thermal blue’ infested with Virginia buttonweed. Sod of centipedegrass ‘common’, hybrid bermudagrass ‘Tifway’, hybrid zoysiagrass ‘Emerald’, and St. Augustinegrass ‘Raleigh’, which had been previously established in pots, were treated simultaneously and returned to a greenhouse. Fluroxypyr plus diflufenzopyr at 280 and 70 g/ha, respectively, controlled Virginia buttonweed nearly 40% more than fluroxypyr alone. Turfgrass injury was species-dependent, and was generally either equivalent to or less than that obtained with fluroxypyr alone. Radiotracer studies established that, depending upon the turfgrass species, fluroxypyr absorption was either not influenced or reduced by the addition of diflufenzopyr. Neither root nor foliar absorption of fluroxypyr by Virginia buttonweed was influenced by diflufenzopyr. Translocation of foliar-absorbed fluroxypyr was reduced, but translocation of root-absorbed fluroxypyr was increased by diflufenzopyr. The diflufenzopyr-induced synergism may indicate that a significant portion of the applied fluroxypyr was absorbed by roots or by other subsoil tissues, or both.

Keywords

Diflufenzopyr 2-(1-[([3,5-difluorophenylamino]carbonyl)-hydrazono]ethyl-3-pyridinecarboxylic acidfluroxypyrVirginia buttonweed, Diodia virginiana L. # DIQVIhybrid bermudagrass, Cynodon dactylon Burtt-Davey X C. transvaalensis L. Pers. ‘Tifway’centipedegrass, Eremochloa ophiuroides (Munro.) Hack. ‘Common’hybrid zoysiagrass, Zoysia japonica Steud. X Z. tenuifolia Willd. Ex Trin ‘Emerald’St. Augustinegrass, Stenotaphrum secundatum (Walt.) Kuntze. ‘Raleigh’hybrid bluegrass, Poa pratensis X P. arachnifera Torr. ‘Thermal Blue’Auxin herbicides14C-fluroxypyrherbicide translocationherbicide synergistpyridine herbicidewarm-season turfgrassDAT, days after treatmentLSS, liquid scintillation spectrometryWAT, weeks after treatment
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 2 , June 2006 , pp. 511 - 519
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: College of Agronomy and Biotechnology, China Agricultural University, 2 W Yanmingyuan Road, Beijing 100094, Peoples Republic of China.

References

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