Proceedings of the Sixty-first Annual Meeting of the Northeastern ...

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THREE-WAY HERBICIDE COMBINATION CONTAINING FLUROXYPYR FOR
POSTEMERGENT BROADLEAF WEED CONTROL IN TURF. D.L. Loughner, J.M.
Breuninger and M.W. Melichar, Dow AgroSciences, Indianapolis, IN.
ABSTRACT
The development of formulated liquid herbicide mixtures containing fluroxypyr
(1-methylheptyl (4-amino-3-5-dichloro-6-fluoro-2-pyridyloxyl) acetate) was initiated
when the residential use registration was removed for all clopyralid (3,6-dichloro-2-
pyridinecarboxylic acid, triethylamine salt) containing mixtures. Mixtures containing
fluroxypyr must provide commercial control of white clover (Trifolium repens) and
other key driver weeds such as dandelion (Taraxacum officinale) and plantain
species (Plantago spp.) to be accepted by lawn care companies.
Results from 2002 - 2004 confirmed effective broadspectrum broadleaf weed
control with the 0.25 lb ae/A rate of fluroxypyr in combination with 2,4-D, triclopyr
and /or dicamba. Control was comparable to commercial standards Triplet® SF,
(2,4-D + dicamba + MCPP-p) and Confront® (triclopyr + clopyralid). Field studies
conducted during 2005 evaluated at 0.13 lb ae/A of fluroxypyr in combination with
2,4-D and dicamba (Escalade® 2). Performance was compared to Triplet, Chaser
(2,4-D + triclopyr), Millennium Ultra® (2,4-D+dicamba+clopyralid) and a tank mix of
2,4-D ester + triclopyr ester + dicamba.
Field protocols were designed to simulate a typical lawn care application
program for postemergence broadleaf weed control in turf. Key program features
evaluated included early season use of ester herbicide formulations changing to
amines as temperatures increased and the use of high water volumes of
approximately 2 gal/1000ft 2 .
The results from 2005 field studies demonstrated that Escalade 2 effectively
controlled key driver weeds such as white clover, dandelion, plantain spp. and
mouseear chickweed equal to, and in some cases better than, the comparative
standards. The data also demonstrated that environmental conditions and weed
development stage did not significantly affect Escalade 2 performance.
Confront is a Trademark of Dow AgroSciences.
Triplet, Escalade and Millennium Ultra are Trademarks of Nufarm Americas.
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