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PURPLE LOOSESTRIFE
Purple loosestrife is a very prolific perennial that reproduces by creeping root and seed. It can be found in marshes, along rivers, ditches, and wet meadows. This European native has no natural enemies making it a serious threat to native plants. It reduces available wildlife habitat, decreases flow in irrigation canals and ditches, and spoils desirable hunting and fishing areas. This weed can be extremely difficult to control. An average size plant can grow up to 12 feet tall and produce more than two million seeds.
Control
Cultural: Water level manipulation is generally unsuccessful.
Mechanical: Burning is not a feasible option. It has no affect on the roots, seeds, or seedlings. Spring and summer burns are not effective because of the plants high moisture content. Mowing does not prevent seed production and can promote adventitious growth. Hand removal methods can be effective for small areas; however, the entire root must be removed from the soil.
Biological: Galerucella calmariensis, commonly known as the Black-margined loosestrife beetle and its sister species Galerucella pusilla are defoliating insects that feed on this wetland weed. They are promising agents that establish and thrive well in Idaho climate. Hylobius transversovittatus, larvae live in the root while adults feed on the foliage. Availability of this insect is limited.
Prevention: The most effective control is prevention. You can help by ensuring that this noxious weed is not transplanted on your home grounds, and by paying attention to the sale of this particular species at your local nursery.
Herbicide: Products containing glyphosate or triclopyr will give good results when applied at the flower stage. Be cautious!
When choosing any kind of control method, assure that your choice is suited for your particular situation. Always read and follow the entire product label before applying any herbicide. |