Category Archives: Weeds

Glyphosate-resistant horseweed in Wisconsin

Ross Recker (Graduate Research Assistant), John Buol (Undergraduate Research Assistant), and Vince Davis (Assistant Professor) Department of Agronomy, UW-Madison During the 2013 late-season survey, another putative glyphosate-resistant horseweed population was collected from Columbia County. Again whole-plant dose response experiments were … Continue reading

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Palmer amaranth identified through the late-season weed escape survey

Vince Davis (Assistant Professor) Department of Agronomy, UW-Madison; Ross Recker (Graduate Research Assistant) Palmer amaranth (Amaranthus palmeri) is a dioecious, summer annual broadleaf weed species in the pigweed (Amaranthaceae) family that is extremely adaptable to environments, including the development of … Continue reading

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Late-Season Weed Survey

Vince M. Davis, Cropping Systems Weed Scientist and Extension Specialist A potential increase in herbicide-resistant weeds, particularly glyphosate-resistant weeds, is a major concern for the sustainability of Wisconsin crop production.  Ross Recker and Dr. Vince Davis are once again conducting … Continue reading

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Big weeds found at the Weed Doctor’s Booth at Farm Technology Days in Barron County

Mark Renz, Extension Weed Scientist This year we had 8 entries into the biggest weed contest.  We aren’t sure why fewer entries were submitted, maybe northern Wisconsin has fewer big weeds? While the earlier date of FTD clearly affected weed … Continue reading

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Survey on Weed Management in Switchgrass and other Perennial Crops

Ariel Larson and Mark Renz, Graduate Student and Extension Weed Scientist, University of Wisconsin-Madison We are currently researching weed management requirements in establishing switchgrass for bioenergy.  To compliment our current efforts to create weed management recommendations during establishment, we have … Continue reading

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High Value Straw and Weedy Wheat….What do I do?

Shawn Conley, Soybean and Wheat Extension Specialist, Vince Davis, Extension Weed Scientist Wet fields made spring weed control difficult to impossible in many winter wheat fields, and prolonged wet conditions have encouraged prolific weed growth from large competitive broadleaf weeds … Continue reading

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Removal of Roundup Ready Alfalfa: What can we learn from 2012

Mark Renz, University of Wisconsin Extension Weed Scientist Alfalfa stand termination has been difficult in 2013.  This is likely due to several factors, including poor regrowth in the fall of 2012, late emergence this spring, and stressed crops due to … Continue reading

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Biggest Weed Contest at Farm Technology Days in Barron County

Mark Renz, UW-Madison Extension Weed Scientist With cooler weather and rain the Weed Doctors are expecting a bumper crop of large weeds.  Have a weed in your field that you think is a prize winner?  Then cut it down and … Continue reading

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A Horseweed Population in Wisconsin is Confirmed Resistant to Glyphosate

Ross Recker (Graduate Research Assistant), Dave Stoltenberg (Professor), Vince Davis (Assistant Professor) Department of Agronomy, UW-Madison Horseweed (Conyza canadensis L.), also known as marestail, is a broadleaf weed species native to North America.  Increased adoption of no-till cropping systems in … Continue reading

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Corn and Soybean Herbicide Use Survey Participation

Vince M. Davis, Extension Weed Scientist and Ross Recker, Graduate Research Assistant The potential increase of glyphosate-resistant weeds is a major threat to corn and soybean production across the Nation.  Integrated Weed Management tactics, including diversified herbicide use, are important … Continue reading

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