Landscape Management, Weed Watch 2014
WEEDWATCH STANDING SENTINEL TO PROTECT PLANT HEALTH Black mustard Brassica nigra 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 Rob Routledge Sault College Bugwood org Left H Zell Wikimedia Recommended Dow AgroSciences solution Lontrel specialty herbicide Recommended Dow AgroSciences solution Gallery specialty herbicide species having four bright yellow petals Control tips To prevent black mustard apply a preemergent herbicide containing isoxaben in late summer or early fall prior to germination A postemergent product containing triclopyr may be applied to small and actively growing plants Ensure good drainage as black mustard prefers moist soil Proper mowing height and fertility also can help prevent establishment in turfgrass Identification tips This genus consists of more than 65 species Most are herbaceous perennials found in open areas Goldenrod often grows in patches In many cases a colony of plants is a clone of a single plant Stems are erect and slender and can grow up to 8 ft tall Long narrow leaves alternate along the stem Most are identified by golden inflorescences clustered on long stalks Goldenrod usually blooms in late summer or early fall Control tips Goldenrod is a very effective colonizer Wind blown seeds can widely disperse and quickly establish in bare soil or places where competition from other plants is light After the first flower buds form and before the first flower opens apply a systemic foliar herbicide which moves down through the plant and injures the root system Products containing clopyralid or triclopyr work well Identification tips Also known as shortpod mustard this winter annual grows profusely and produces allelopathic chemicals that prevent germination of native plants Stems grow erect with a slight covering of stiff hairs on the lower portion and a smooth top half Leaves do not clasp around the stem Lower leaves are lobed upper leaves are toothed Flowers resemble other Brassica or Cruciferae Goldenrod Solidago spp Trademark of The Dow Chemical Company Dow or an affiliated 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 59 september 2014 LANDSCAPEMANAGEMENT NET
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