Landscape Management, Weed Watch 2014
WEEDWATCH STANDING SENTINEL TO PROTECT PLANT HEALTH CREEPING WOODSORREL Oxalis corniculata For more information regarding these and other turf weeds and related control technologies and tips please visit www DowProvesIt com or call 800 255 3726 BROUGHT TO YOU BY PHOTOS COURTESY DR SHAWN ASKEW LEFT FOREST KIM STARR U S GEOLOGICAL SURVEY BUGWOOD ORG Recommended Dow AgroSciences solution Gallery specialty herbicide Recommended Dow AgroSciences solution Dimension specialty herbicide this plant can actually be spread through such practices If lawn mowers are used where creeping woodsorrel is growing wash or air spray mowers to remove seeds and clippings before moving to a weed free turf Once established it is very competitive Application of a pre emergent herbicide labeled for Oxalis control in the fall is a good option Two applications four to six weeks apart may be needed to get all the seedlings State restrictions on the sale and use of Dimension apply IDENTIFICATION TIPS This plant which prefers cool rich moist soils is a winter or summer annual It can also be a biennial in coastal areas It features a single stem or branched upright growth 6 to 18 in tall and its yellow lowers bloom nearly year round Leaves are highly variable from hairless to lightly covered with long wavy or cotton like hairs Groundsel reproduces by seed each plant may produce three to four generations of seeds in one season CONTROL TIPS Because the seed is easily spread and can potentially deposit numerous seeds throughout the season the best option for control is an earlyseason application of a pre emergent broadleaf herbicide with at least three months residual such as one containing the active ingredient isoxaben To prevent common groundsel infestation use good sanitation practices supplemented with preemergence broadleaf herbicides IDENTIFICATION TIPS This summer perennial contains a slender shallow taproot and roots at nodes along the creeping slightly hairy stems Leaves are deeply loped heart shaped and may be green to reddish purple Flowers are small and bright yellow with ve petals and form in clusters of one to ve at the end of slender stems CONTROL TIPS Mowing fertilizing or irrigating turf is not an effective method of control COMMON GROUNDSEL Senecio vulgaris 13 NOVEMBER 2010 LANDSCAPEMANAGEMENT NET
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