Landscape Management, Weed Watch 2014
WEEDWATCH STANDING SENTINEL TO PROTECT PLANT HEALTH 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 FRED YELVERTON LEFT DR SHAWN ASKEW Recommended Dow AgroSciences solution Dimension specialty herbicide Recommended Dow AgroSciences solution Gallery specialty herbicide Its seeds are encased in glossy black achenes CONTROL TIPS Smartweed prefers disturbed areas and tends to grow in moist soil Ensure good drainage Correct mowing height and fertility also can help prevent smartweed establishment Apply a pre emergence herbicide in early spring prior to germination of summer annuals State restrictions on the sale and use of Dimension specialty herbicide products apply PENNSYLVANIA SMARTWEED Polygonum pensylvanicum IDENTIFICATION TIPS This summer annual grass is commonly found in the Midwest and southeastern United States Easily identi ed by the seedhead which is a spike of tiny burs it thrives in low fertility sandy soils Sandbur forms in clumps because of a lack of rhizomes and stolons Leaves are folded in the bud and the ligule is a fringe of hairs CONTROL TIPS A pre emergence herbicide program should be used where sandbur is a known problem Many pre emergence herbicides used for crabgrass or goosegrass control also will control sandbur Check the label Sequential applications 60 days apart of a preemergence graminicide will ensure early and late germinating control of sandbur Be sure to get your rst application down prior to crabgrass germination IDENTIFICATION TIPS As a member of the buckwheat family this summer annual can grow up to 4 ft tall with multiple branching Its stems are smooth and reddish purple with swollen nodes The leaves alternate and are lance shaped with a red watermark Bristleless sheaths wrap around the stem at the base of the petioles Small bright pink lowers form dense spike like clusters on the stems from July through October FIELD SANDBUR Cenchrus incertus 33 JULY 2012 LANDSCAPEMANAGEMENT NET
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