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Purple loosestrife


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Purple loosestrife


Lythrum salicaria L. Loosestrife Family

Key identifying traits




Biology and ecology




Control


Prevention – Learn to identify plants; beware of ornamental varieties & contaminated boats/motors

Biological – Some very effective agents available and established in our county; substantial impact on plant vigor and reproduction (Galerucella & Hylobius)

Cultural – Competitive vegetation helps although plants can invade healthy native as well as managed introduced plant habitats

Mechanical – Small infestations can be dug, bagged and disposed of taking care not to disperse seeds

Chemical – Non-selective or broad leaf herbicides can be effectively used depending on site; if plants are in bloom, clip/bag flowers prior to spray; special care, permit and license required for aquatic applications




browning plants due to biocontrol damage




cutting flowering heads to bag prior to spray

Where found – Infestations at Waitts Lake, Loon Lake and Lake Spokane; a few other minor infestations have been located in pastures and along ditches elsewhere in Stevens County.




Created by Stevens County Noxious Weed Control Board, February 2000; Updated Jan 2004


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