Yellow Woodsorrel (Oxalis) Biology and Management in Turf1
Yellow woodsorrel (Oxalis stricta) is an upright, herbaceous perennial with hairy stems. Leaves are alternate and divided into three partly folded, deeply cut, heart-shaped lobes. Flowers are bright yellow with five petals on stalks bent below the fruit and attached to a common point. Fruit are narrow, "okra-like" capsules. Florida yellow woodsorrel (O. florida) is similar in appearance to yellow woodsorrel, but has slenderer stems, larger leaves, and a smooth to sparingly hairy, smaller capsule. Reproduction occurs via seed.
Herbicide Options for Controlling Yellow Woodsorrel in Florida Turfgrass
(Always refer to the label for specific uses, application rates, and turfgrass tolerance)
Bermudagrass
Preemergence: dithiopyr, indaziflam, isoxaben, napropamide, oxadiazon, pendamethalin, prodiamine+isoxaben
Postemergence: bromoxynil, carfentrazone, 2,4-D+dicamba, dicamba, imazaquin, metsulfuron, metribuzin, penoxsulam+sulfentrazone+dicamba+2,4-D, sulfentrazone, sulfentrazone+quinclorac, thiencarbazone+iodosulfuron+dicamba, thiencarbazone+floramsulfuron+halosulfuron, triclopyr +clopyralid, trifloxysulfuron
St. Augustinegrass
Preemergence: atrazine, dithiopyr, indaziflam, isoxaben, napropamide, oxadiazon, pendamethalin, prodiamine+isoxaben
Postemergence: atrazine, bromoxynil, carfentrazone, 2,4-D+dicamba (follow label recomendations to minimize turf injury), imazaquin, metsulfuron, penoxsulam+sulfentrazone+dicamba+2,4-D, sulfentrazone, thiencarbazone+iodosulfuron+dicamba
Centipedegrass
Preemergence: atrazine, dithiopyr, indaziflam, isoxaben, napropamide, pendamethalin, prodiamine+isoxaben
Postemergence: atrazine, bromoxynil, carfentrazone, clopyralid, 2,4-D+dicamba, dicamba, imazaquin, mesotrione, metsulfuron, penoxsulam+sulfentrazone+dicamba+2,4-D, sulfentrazone, sulfentrazone+quinclorac, thiencarbazone+iodosulfuron+dicamba, triclopyr +clopyralid
Bahiagrass
Preemergence: dithiopyr, indaziflam, isoxaben, napropamide, pendamethalin, prodiamine+isoxaben
Postemergence: bromoxynil, carfentrazone, 2,4-D+dicamba, dicamba, triclopyr, sulfentrazone, triclopyr +clopyralid
Seashore Paspalum
Preemergence: dithiopyr, indaziflam, oxadiazon, pendamethalin, prodiamine+isoxaben
Postemergence: carfentrazone, penoxsulam+sulfentrazone+dicamba+2,4-D, sulfentrazone, sulfentrazone+quinclorac
Zoysiagrass
Preemergence: atrazine, dithiopyr, indaziflam, isoxaben, oxadiazon, pendamethalin, prodiamine+isoxaben
Postemergence: atrazine, bromoxynil, carfentrazone, 2,4-D+dicamba, dicamba, imazaquin, metsulfuron, penoxsulam+sulfentrazone+dicamba+2,4-D, sulfentrazone, sulfentrazone+quinclorac, thiencarbazone+iodosulfuron+dicamba, triclopyr+clopyralid, trifloxysulfuron
Perennial Ryegrass
Preemergence: oxadiazon
Postemergence: bromoxynil, carfentrazone, 2,4-D+dicamba, dicamba, sulfentrazone, sulfentrazone+quinclorac, triclopyr +clopyralid
Refer to the publication Pest Control Guide for Turfgrass Managers at http://turf.ufl.edu/pdf/2012_UF_Pest_Control_Guide.pdf for brand names associated with chemical names listed.