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Download Pineapple weed - Stevens County
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Pineapple-weed Matricaria matricarioides (syn. Matricaria discoidea) Sunflower Family Key identifying traits Plant stems grow erect up to 1’ tall Leaves are divided into short narrow segments Heads are cone-shaped and a yellowish green color with each head surrounded by overlapping bracts with no ray petals Crushed heads give off a odor likened to pineapple Biology and ecology An annual plant reproducing by seeds Pineapple-weed is a native to western North America but now considered naturalized in the U.S. It is a nuisance in lawns and gardens and is also found in croplands and along roadsides Similar to mayweed chamomile which has a unpleasant odor and white ray flowers Control Prevention – Learn to identify plants; start monitoring early in the season Biological – No known biological control in our area Cultural – Plant competitive grass or other cover crops Mechanical – It can be hand pulled but does not effectively mowed Chemical –the PNW Weed Management handbook does not have it listed as a problem weed but other sources list mixtures such as Trimec as effective. Also a pre-emergent herbicide application can help prevent seed germination *University of California lists Chamomilla suaveolens as the Tom Heutte, USDA Forest Service, www.forestryimages.org scientific name* of this plant. Where found –Scattered throughout the county; seen in many gardens, lawns, and driveways. Stevens County Noxious Weed Control Board, December 2009