Tuesday, November 14, 2006
172-6
Three-Way Fluroxypyr Herbicides for Postemergent Broadleaf Weed Control in Turf.
Darin Lickfeldt, Dan Loughner, Mike Melichar, and James Breuninger. Dow Agrosciences, 9330 Zionsville Rd., Indianapolis, IN 46268, United States of America
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 key end-use lawncare companies. Results from 2002 – 2004 confirmed effective broadspectrum broadleaf weed control with fluroxypyr at 0.25 lb ae/A in combination with 2,4-D, triclopyr and /or dicamba. Control was comparable to commercial standards Triplet® SF Selective Herbicide (2,4-D + dicamba + MCPP-p) and Confront® Specialty Herbicide (triclopyr + clopyralid). Seven field studies conducted in cool season turf during 2005 evaluated reduced rates of fluroxypyr in combination with 2,4-D and dicamba. This mixture, EscaladeTM 2, was created by Nufarm/Riverdale and contained 0.125 lb ae/A of fluroxypyr. The performance of EscaladeTM 2 was compared to commercial herbicides Chaser® Turf Herbicide (2,4-D + triclopyr), Triplet SF® Selective Herbicide (2,4-D + dicamba + MCPP-p), Millennium UltraTM Selective Herbicide (clopyralid + 2,4-D + dicamba) and a tank mix treatment of 2,4-D ester + triclopyr ester + dicamba. Weeds control performance evaluations included: dandelion (Taraxacum officinale), white clover (Trifolium repens), buckhorn plantain (Plantago lanceolata), broadleaf plantain (Plantago major), ground ivy (Glechoma hederacea) and mouseear chickweed (Cerastium vulgatum). Results demonstrated that EscaladeTM 2 controlled weeds such as white clover, dandelion, plantain spp. and mouseear chickweed equal to and in some cases better than the comparative herbicides. The data also demonstrated that environmental conditions and weed development stage do not significantly affect EscaladeTM 2 performance.