Sunday, 20 May 2018

Palmer Amaranth Alert: Check CRP Seed Mixes

Palmer amaranth can produce 500,000 seeds per plant.

Native to the desert southwest, Palmer amaranth can produce 500,000 seeds per plant and has developed resistance to glyphosate (Roundup).

DATCP Lists Palmer amaranth as Prohibited Noxious Weed 

The Wisconsin Department of Agriculture, Trade and Consumer protection (DATCP) recently issued a new emergency rule listing Palmer amaranth (Amaranthus palmeri) as a prohibited noxious weed seed. Including it in a seed mix will now result in a civil or criminal violation for the seed labeler.

Palmer amaranth is a broadleaf weed that grows 2-3 inches a day. It commonly grows 6-8 feet tall, but may reach 10 feet. This plant has separate male and female plants, and the females may produce as many as 500,000 seeds. 

Though native to southwestern states, it became established in the southeast and began moving north. Pollinator seed mixes that contain Palmer amaranth were sold for use on Conservation Reserve Program (CRP) lands in Iowa, Illinois, Minnesota, Indiana and Ohio. More than half the counties in Iowa now report the new invader.


Palmer amaranth is related to water hemp and other “pigweeds”, common in Wisconsin, and a casual observer might confuse the two. The leaf stem on the first true leaves are longer than the leaf blade, where water hemp leaf blades are longer than the leaves. The most obvious difference is the length of the seed heads. Palmer amaranth has seed heads that can be 12 inches or longer. Hence it can produce vastly more seed than its native cousin. Purdue Extension has an excellent video that describes the distinguishing characteristics.

Herbicide Resistance

Strains of Palmer amaranth have developed tolerance for the herbicide glyphosate, making control much more difficult. Farmers in other states started using dicamba but are finding that off target herbicide drift is a real problem for both surrounding crops and natural lands.

Keep In Mind

DATCP has the following advice. If you are planting a pollinator or conservation seed mix:

  • Find out what Palmer amaranth looks like. You can find many clear photos in an online image search.
  • Buy local seed mixes if possible, with no pigweed or amaranth listed on the label.
  • Thoroughly clean equipment after seeding, especially if your seed mix came from out of state.
  • Call your University of Wisconsin-Extension office if you suspect you have found Palmer amaranth.

Follow these tips for conservation planting—without weed seed come from our neighbors at the Minnesota Department of Agriculture:

  • Do not purchase unlabeled seed
  • Check labels—and keep all labels used in a specific planting
  • If restricted noxious weeds are present make sure they’re present at a rate of less than 25 seed per pound
  • Don’t use seed with any prohibited noxious weed seeds
  • Ask seeding contractor for planting records including: seed lots planted in specific locations, planting procedures, site preparation and equipment used with equipment cleanout records
  • Keep invoices and paperwork
 Contact your local Extension agent for the most current information about this and other weed problems on your land.


June 2017

Tuesday, 13 June 2017

Let’s Get Cutting

With the early onset of hot weather in Wisconsin, wild parsnip is now starting to bloom. This is the best time to mow this serious invasive plant.

Check out this article by WDNR invasive plants coordinator Kelly Kearns:

Wild parsnip blooms early, time to mow or take other control steps

Remember to watch out for wild parsnip sap. If you get it on your skin while exposed to sunlight, the sap causes serious chemical burns.


August 2016

Sunday, 14 August 2016

March 2016

Thursday, 03 March 2016

Weed Management

These organizations specialize in guarding our land and water from invasive plants, animals and diseases.



Adirondacks Park Invasive Plant Program
Appalachian Ohio Weed Control Partnership

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Bayfield Regional Conservancy
Becker County (MN) CWMA
Blue Mounds (WI) Area Project
Brown County (WI) Invasive Plant Group


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C.A.K.E Cooperative Invasive Species Management Area
Capital – Mohawk Partnership for (NY) Regional Invasive Species Management
Carlton County (MN) CWMA
Catskill Regional (NY) Invasive Species Partnership
Center for Invasive Species and Ecosystem Health – U of Georgia
Central Minnesota CWMA
Central Upper Peninsula CWMA
Clay County CWMA
Clearwater County (MN) Weed Task Force
Coalition of Prescribed Fire Councils
Coastal (NH) Watershed Invasive Plant Partnership
Cook County (MN) Aquatics Invasives Team
Cook County (MN) Invasives Team
Crooked River CWMA (OH)

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Detroit River Western Lake Erie (MI) CWMA
Door County (WI) Invasive Species Team

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Eastern Mahnomen County Weed Management Area CWMA
Eastern Upper Peninsula (MI) CWMA
Eight Mile River (CT) Invasive Species Management Area

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Finger Lakes (NY) PRISM
Florida Exotic Pest Plant Council

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Georgia Prescribed Fire Council
Greater Sauk County (WI) Invasive Plant Team

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Hawkeye CWMA
Headwaters Invasive Plant Partnership

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Indiana Costal CWMA
Invasive Plant Association of Wisconsin

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Juiata CWMA

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Kandiyohi-Stearns (MN) CWMA
Kenebec County (ME) CISMA
Kenabec County (ME) Weed Management Area Partnership
Keweenaw Invasive Species Management Area

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Lake County (MN) Invasives Team
Lake Erie (OH) CWMA
Lake Erie (PA) CWMA
Lakeshore (WI) Invasive Species Management Area
Long Island PRISM
Lower Chippewa Invasives Partnership
Lower Hudson (NY) PRISM

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Mahaska County Integrated Roadside Vegetation Management
Michigan Invasive Species Coalition
Midwest Invasive Plant Network
Monroe County Invasive Plant Team

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National Invasive Species Council

New Jersey Invasive Species Strike Team
New River Gorge CWPMA (WV)
Norman County CWMA
North Central (WI) Conservancy Trust
North Central (MI) CWMA
North Central Weed Science Society
North Country CISMA
Northeast Illinois Invasive Plant Partnership
Northeast Iowa CWMA
Northeast Michigan CWMA
Northern Illinois Invasive Plant Partnership
Northern Indiana Invasives Management
Northwest Indiana Cooperative Invasives Management
Northwest Michigan Invasive Species Network
Northwoods Cooperative Weed Management Area

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Oak Openings Region CWMA
Ottauquechee Cooperative Invasive Species Management Area (OCISMA)

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PCA Alien Plant Working Group
Potomac Highlands Cooperative Weed & Pest Management Area
Pope-Swift (MN) CWMA

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Ramsey County (MN) CWMA
Red Lake (MN) Cooperative Weed Management Program
Rice County (MN) CWMA
River to River CWMA

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Saginaw Bay CWMA
St. Croix Red Cedar CWMA (WI)
St. Lawrence Eastern Lake Ontario (NY) PRISM
St. Louis County (MN) CWMA
Scott (MN) CWMA
Sea to Sky Invasive Species Council (WA)
Sinnemahoning Invasive Plant Management Area
South Laurel Highlands Plant and Pest Management Partnership
Southeastern Wisconsin Invasive Species Consortium
Southern Indiana Cooperative Invasives Management
Southwest Wisconsin Invasive Species Consortium
Steele County (MN) Invasive Species Management Area
Stewardship Network, The
Stewardship Network, The – Grand Raisin Cluster
Stewardship Network, The – Headwaters Cluster
Stewardship Network, The – Huron Arbor Cluster
Stewardship Network, The – Lakeplain Cluster
Stewardship Network, The – Mid-Michigan Cluster
Stewardship Network, The – Northern Indiana Cluster
Stewardship Network, The Raisin Cluster
Stewardship Network, The – Southwest Corner Cluster
Stewardship Network, The – Three Counties Cluster
Stewardship Network, The – West Michigan Cluster
Stewardship Network, The – Western Lake Erie Cluster
Sudbury-Assabet-Concord River (MA) Watershed CISMA

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Thief River (MN) Watershed CWMA
Timberland Invasives Partnership
Tionesta (PA) Watershed Japanese Knotweed Treatment

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Upper Chippewa Invasive Species Cooperative
Upper Connecticut (VT/NH) CISMA
Upper White River (VT) CWMA

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Wadena County (MN) Cooperative Weed Management Project
Wabasha County CWMA
Washington County/St.Croix River CWMA
West Central Indiana CWMA
West Central Wisconsin Invasive Plant Management Area
Western New York PRISM
Western Peninsula Invasives Coalition – Michigan Invasive Species Coalition
Westfield (MA) Invasive Species Partnership
White Mountain (NH) Early Detection Network
Wild Rivers Invasive Species Coalition (WI)
Wisconsin Headwaters Invasives Partnership
Wright Cooperative Weed Management Area (CWMA)

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