Landscape Management, Weed Watch 2014
WEEDWATCH STANDING SENTINEL TO PROTECT PLANT HEALTH PROSTRATE KNOTWEED Polygonum aviculare Pictured Polygonum aviculare ssp buxiforme 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 RONALD CALHOUN LEFT STAN SHEBS Recommended Dow AgroSciences solution GoalTender herbicide Recommended Dow AgroSciences solution Gallery specialty herbicide Small inconspicuous white to pinkish lowers grow in the area between the stems and leaves CONTROL TIPS As soon as temperatures warm up in the spring apply a pre emergence herbicide such as isoxaben labeled for knotweed control Maintain a dense healthy turf that will compete well with knotweed by the proper use of fertility maintaining an appropriate mowing height for your turfgrass uniform watering and compacted soil aeri cation IDENTIFICATION TIPS This prostrate summer annual grows rapidly in warm months and tolerates poorly compacted soils and drought Its distinct leshy succulent foliage sets it apart from other weed species Seedlings are oblong succulent and hairless Leaves are alternate rounded at the apex and narrowed to the base Young leaves are maroon on the lower surface Small yellow lowers bloom from May through September on hot sunny days CONTROL TIPS Apply herbicide labeled for your use site for preand post emergence control Oxyluorfen is most effective when applied as a post emergent to seedling purslane and will deliver residual control of emerging seeds Once the area is free from purslane use good management practices to prevent reinfestation Clean cultivation and seeding equipment that may have been used in infested areas Remove any purslane escapes before they set seed to minimize reinfestation IDENTIFICATION TIPS This prostrate summer annual is commonly found in pathways sports elds and other compacted areas of turfgrass Cotyledons are narrow linear and often mistaken for grass Stems below the cotyledons are often reddish in color Leaves are arranged alternately along the stem Short petioles and a distinctive thin membranous sheath encircle the stem at the leaf base COMMON PURSLANE Portulaca oleracea 21 JULY 2011 LANDSCAPEMANAGEMENT NET
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