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Nebraska’s Noxious Weeds 1. Canada Thistle - 1873 2. Musk Thistle - 1962 3. Leafy Spurge - 1962 4. Plumeless Thistle - 1975 5. Spotted Knapweed - 1992 6. Diffuse Knapweed - 1992 7. Purple Loosestrife – January 2001 8. Saltcedar –January 2005 9. Phragmites – April 2008 10. Japanese Knotweed – February 2011 11. Giant Knotweed– February 2011 12. Sericea Lespedeza – April 1, 2013
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Noxious Weed Control Act
• The failure to control noxious weeds on lands in this state is a serious problem which is detrimental to the production of crops and livestock and to the welfare of residents of this state and which may devalue land and reduce tax revenue;
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Noxious Weed Control Act
• It is the duty of each person who owns or controls land to effectively control noxious weeds on such land.
• County boards or control authorities are responsible for administration of noxious weed control laws at the county level
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed
February 2011 • Sericea Lespedeza – April 2013
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Musk Thistle can pretty much grow anywhere if
given the chance. This one tried to grow on a concrete slab with ¼ inch gap shown
below.
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Bare and showing no stem wings
Stem wings extending Up to flower – note the
different bracts below the flower
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Seed heads / Flower much smaller – Dime Size in general and in dense clusters on terminal ends
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Dense Monoculture
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Other Thistles – Common to NE • Wavyleaf Thistle • Tall Thistle • Bull Thistle • Scotch Thistle
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001
• Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Saltcedar seen as an ornamental at Mary Lanning Memorial
Hospital in Hastings
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005
• Phragmites – became a noxious weed April 2008 • Knotweeds, Japanese & Giant – became noxious weed February
2011 • Sericea Lespedeza – April 2013
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Not all Phragmites found around lakes and streams
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Platte River channel near Lexington
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Seed heads during the Winter
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife – became a noxious weed Jan. 2001 • Saltcedar – became a noxious weed Jan. 2005 • Phragmites – became a noxious weed April 2008
• Knotweeds, Japanese & Giant – became noxious weed February 2011
• Sericea Lespedeza – April 2013
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Japanese Knotweed early spring
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Nebraska’s Noxious Weeds • Musk Thistle • Plumeless Thistle • Canada Thistle • Spotted and Diffuse Knapweed • Leafy Spurge • Purple Loosestrife • Saltcedar • Phragmites • Knotweeds, Japanese & Giant • Sericea Lespedeza – April 2013
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Control Recommendations
UNL Extension EC 130 Guide for Weed Management in Nebraska Noxious Weed Section • Herbicide • Rates & Timing • Cost
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Thank you For more information on noxious weed ID. Butler County Weed Control Office: 402-367-7446 Cell: 402-270-9333 [email protected]