Landscape Management, Weed Watch 2014
WEEDWATCH STANDING SENTINEL TO PROTECT PLANT HEALTH BRISTLY OXTONGUE Picris echioides 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 MICHAEL SHEPHARD USDA FOREST SERVICE BUGWOOD ORG LEFT STEMONITIS WIKIMEDIA ORG Recommended Dow AgroSciences solution Lontrel specialty herbicide Recommended Dow AgroSciences solution Gallery specialty herbicide Yellow lowerheads resemble dandelion and grow from the top of the lowering stem Petals have toothed tips CONTROL TIPS For optimum control apply a preemergent herbicide containing isoxaben prior to germination Any existing oxtongue must be physically or chemically removed prior to herbicide application Landscape bed tilling and herbicide application prior to planting also will help prevent this weed IDENTIFICATION TIPS This taprooted annual has a basal rosette and leaves similar to dandelion Taraxacum of cinale Leaves are egg shaped with the wider portion toward the tip They are usually dissected or lobed Basal leaves grow on petioles stem leaves do not Stems are erect without hairs and branch at the base Up to 20 yellow lowers bloom in an open cluster at the top of the plant and on stems branching from the leaf axis near the top CONTROL TIPS This plant is very invasive particularly in nutrientrich environments Apply a postemergent herbicide containing clopyralid to actively growing weeds Only weeds that have emerged at the time of application will be affected Once hawksbeard is under control mulch landscape beds and encourage strong healthy turf through proper fertilization irrigation and mowing IDENTIFICATION TIPS This erect winter or summer annual or sometimes biennial broadleaf weed is commonly found in the Northern U S as well as in California and Nevada Its seed leaves are broadly stalked oval and hairless The rst true leaves are egg shaped and covered with coarse barbed and bristly hairs which grow from blister like swellings Later leaves become increasingly larger Until the lower stem develops plants exist as basal rosettes NARROWLEAF HAWKSBEARD Crepis tectorum Trademark of The Dow Chemical Company Dow or an af liated company of Dow State restrictions on the sale and use of Lontrel apply Consult the label before purchase or use for full details Always read and follow label directions 47 SEPTEMBER 2013 LANDSCAPEMANAGEMENT NET
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