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 61 november 2014 LANDSCAPEMANAGEMENT NET Photos S ASKEW LEFT Forest and Kim Starr Starr Environmental Bugwood org Recommended Dow AgroSciences solution LockUp specialty herbicide Recommended Dow AgroSciences solution Gallery specialty herbicide Control tips Red sorrel grows in undisturbed poorly drained soils Low nitrogen fertility also encourages the growth of this weed Keep pH and fertility soil levels within appropriate local guidelines Apply a preemergent herbicide containing isoxaben in combination with a postemergent application containing clopyralid when plants are in the rosette stage Make the same application again in late spring to maximize control Red sorel Rumex acetosella Identification tips This warm season perennial often is found in moist to wet sites or anywhere with excess moisture Its green glossy leaves are round and scalloped resembling a miniature lily pad A long slender petiole is attached to the center of the leaf forming an umbrella like appearance Dollarweed often is confused with dichondra where the petiole is attached to the edge of a kidney shaped leaf Control tips Avoid excess mois ture by minimizing irrigation and improving drainage Most turfgrass species can survive with less moisture than dollarweed Apply a postemergent herbicide containing penoxsulam when dollarweed is actively growing and in the one leaf toflower stage Dollarweed is a difficult weed to control for an entire growing season Repeat spring or fall applications may be necessary Identification tips This summer perennial grows best in acidic soils and can be used as an indicator of low soil pH Leaves alternate and form a basal rosette Mature leaves are arrowhead shaped with two basal lobes attached to a petiole Leaves growing along the stem are more elongated and usually lack the basal lobes The leaves become thick and fleshy over the summer months The margins of the leaf are smooth Dollarwed Pennywort Hydrocotyle spp Trademark of The Dow Chemical Company Dow or an affiliated company of Dow State restrictions on the sale and use of LockUp apply Consult the labels of products containing LockUp before purchase or use for full details Always read and follow label directions
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