Landscape Management, Weed Watch 2014
WEEDWATCH STANDING SENTINEL TO PROTECT PLANT HEALTH Hairy willowherb Epilobium hirsutum 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 LANDSCAPEMANAGEMENT NET August 2014 58 PHOTOS ZooFari Wikimedia left Frank Vincentz Wikimedia Recommended Dow AgroSciences solution Dimension specialty herbicide Recommended Dow AgroSciences solution Dimension specialty herbicide growth and the entire plant is covered with rose purple flowers by mid summer Control tips Small infestations can be dug up but make sure the rhizomes and the root fragments are removed as well Its best to never let this perennial get established Prior to germination apply a preemergent herbicide containing dithiopyr Make sequential applications at three to four month intervals for extended control Identification Tips This member of the mustard family is a competitive winter annual commonly found in gardens turf and other disturbed sites Seedlings are oval hairless and grow on stalks that are equal in length to the blade Shallow toothed leaves grow away from the base of the plant and alternate along the stem Young plants exist as rosettes until they develop flowering stems at maturity Control tips Apply a preemergent herbicide containing dithiopyr prior to germination in the fall in turfgrass or landscape settings London rocket does not compete well with actively growing turf Maintaining a healthy turf stand is the best control option Hand weeding is a viable control method only if the population is small and isolated Identification Tips This semiaquatic perennial weed is commonly found in shady coastal areas and nursery containers Axillary buds found at the base of the stem produce stolons The stolons produce adventitious roots which pull the stolons into the ground and develop into rhizomes Leaves are opposite long and toothed They are also sessile often clasping at the base Flower buds develop after 10 to 12 weeks of London rocket Sisymbrium irio Trademark of The Dow Chemical Company Dow or an affiliated company of Dow State restrictions on the sale and use of Dimension specialty herbicide products apply Consult the label before purchase or use for full details Always read and follow label directions
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