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endstream endobj 183 0 obj<>>>/LastModified(D:20060308130710)/MarkInfo<>>> endobj 185 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>>/StructParents 0>> endobj 186 0 obj<> endobj 187 0 obj<> endobj 188 0 obj<> endobj 189 0 obj<> endobj 190 0 obj<> endobj 191 0 obj<> endobj 192 0 obj<> endobj 193 0 obj<> endobj 194 0 obj<>stream Larval feeding in the seedhead destroys the knapweed seed before it matures. Because so few prairie areas remain in our state — less than 1% of what was historically present — spotted knapweed reduction is a top priority in any restoration project. Google knapweed insects for many sources. Always use a surfactant as a sticker. 0000006927 00000 n Handpulling: This is an extremely effective method on small-scale infestations of spotted knapweed. Knapweed is a noxious weed that is often found in ditches, along highways, in waterways and other scrubby areas. Brought over accidentally in ship ballast in the 1800s, this Eurasian plant is a pernicious prairie threat. Russian knapweed is much more difficult to control than its less aggressive cousins. Due to its aggressive behavior, it is considered a restricted or noxious weed in 13 states of the U.S and 4 Canadian provinces. Spray before noon or after five when wind is calm and temperatures are under 80 degrees Fahrenheit. When digging or pulling, try to remove as much of the root as possible to prevent regrowth. 0000007060 00000 n Ìà^årÅÖz]Þ¶\+yR)XA E+_Ó3 AÀää /ÓÓݧÏ\eïÞ]ßÞ|ù 9ìýû¿Ü°+í®8ËÙÕõç;<7W×W×ëµÃ8[oñë:Å×'¼°uøCïÿ¡¯jÆÞzs NdGnlýtµ`ËõWÖWnáãº÷Ë;¿C7¶ãpN¾,z. 1. Spotted knapweed can be removed by hand-pulling or digging with a spade in less dense areas (0 to 10 plants per m2) during volunteer work days. This acts as a glue to keep the chemicals on the leaves. Russian knapweed is the most difficult to handle, since this perennial knapweed digs in for the long haul – it can set roots as deep as 20 feet below the surface of the soil. In denser areas (>10 plants per m2) repeated spot-burning with trained individuals is more effective and efficient. Diffuse Knapweed (Centaurea diffusa) also grows a single, branched stem from a similar looking rosette. 0000007360 00000 n Property owners in King County are required to control this plant. He added that Milestone, Perspective and Streamline are all effective herbicides to kill spotted knapweed. 0000014860 00000 n It is predicted that the species was spread via alfalfa and clover seeds. also effective, if applied to the rosettes prior to bolting. This species is also on the Washington quarantine list (known as the prohibited plants list) and it is prohibited to transport, buy, sell, offer for sale, or to distribute plants or plant parts, seeds in packets, blends or \"wildflower mixes\" of this species, into or within the state of Washington. Spotted knapweed is a biennial or short-lived perennial herbaceous plant that grows two to three feet tall. "There's an old adage in the invasive species world 'if you want to get rid of leafy spurge, introduce knapweed,'" says Doug Cattani, a researcher in the plant science department at the University of Manitoba. Russian knapweed is a creeping perennial that reproduces from seed and vegetative root buds. It can form dense cover in prairies, pastures, and open habitats. 0000015054 00000 n Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. It has become a serious problem of pastures and rangeland in the western United States. Note: Chemical control should only be used as a last resort, as organic approaches are safer and much more environmentally friendly. Thomas - Thanks for your detailed and helpful response about all the bio-control species in our area. xÚb```b``Ie`2ø(Æ They only attack knapweed but may take several years. The shorter-lived spotted knapweed, diffuse knapweed and yellow starthistle reproduce primarily by seed, but each produces hundreds or thousands of seeds that can survive in the soil up to five years, so they’re not easy customers. A 2005 survey conducted by the Colorado Department of Agriculture found over 138,400 acres infested with diffuse knapweed and over 10,000 acres infested with spotted knapweed. 0000003818 00000 n A single square foot of spotted knapweed can produce 5,000 seeds, which can remain viable for eight years or more. 5. Spotted knapweed can also be controlled through hand pulling. If you're a nozzlehead Starane works excellent, Tordon even better. Spraying in the spring when the plants are out of dormant stage and begin bolting, flowering and seed-making will give you better control. 0000000016 00000 n 0000003572 00000 n If the plant is found in cropland, then a combination of cultivation and herbicide treatments will suppress the plant.
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