Landscape Management, Weed Watch 2014
WEEDWATCH Recommended Dow AgroSciences solution LockUp specialty herbicide DOLLARWEED PENNYWORT Hydrocotyle spp BROUGHT TO YOU BY Recommended Dow AgroSciences solution Dimension specialty herbicide IDENTIFICATION TIPS Green glossy leaves round in shape with scalloped edges Long slender petiole is attached to the center of the leaf forming an umbrella like appearance Not to be confused with dichondra in which the petiole is attached to the edge of a kidney shaped leaf Clusters of white lowers form in summer Plants reproduce from rhizomes and seeds Most often found in moist to wet sites or anywhere moisture is in excess CONTROL TIPS Minimize irrigation Most turfgrasses can survive with less moisture than dollarweed can Apply a post emergent granule or liquid herbicide when dollarweed is actively growing Dollarweed is a dif cult weed to control for an entire growing season Repeat spring or fall applications may be necessary IDENTIFICATION TIPS This summer annual germinates when soil temperatures reach a consistent 55 F Offers prostrate growth habit with leaves and sheaths that do not have hairs Rolled vernation It can be distinguished from Large crabgrass Digitaria sanguinalis see page 24 of the February 2010 issue by the absence of hairs on the leaves and sheaths Both species will grow under close mowing but smooth crabgrass can survive and set seed at heights as low as 1 4 in PHOTOS COURTESY SHAWN ASKEW LEFT RONALD CALHOUN SMOOTH CRABGRASS Digitaria ischaemum STANDING SENTINEL TO PROTECT PLANT HEALTH Seedhead features two to six nger like spiked branches CONTROL TIPS When soil temperatures reach 55 F in the spring apply a pre emergent grass herbicide Choose the formulation that works best for your operation There are several liquid granular and fertilizer granule options Consult the appropriate product label for recommended rates for your area as well as reseeding and overseeding recommendations 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 5 MARCH 2010 LANDSCAPEMANAGEMENT NET
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