Category Archives: Weeds

2015 Weed emergence “on target” in Wisconsin

Mark Renz Extension Weed Scientist, Agronomy Department, University of Wisconsin-Madison Knowledge of weed emergence is very important as it help in the selection and optimization of early season weed control. While typically weed emergence is consistent from year to year, … Continue reading

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Common ragweed confirmed ALS inhibitor-resistant in Brown County Wisconsin

Recently, Thomas Butts, a graduate research assistant, Vince Davis, and Dave Stoltenberg confirmed that a common ragweed population in Wisconsin is resistant to an ALS inhibitor. Here is the conclusion from their research paper (linked below) which stresses resistance management … Continue reading

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5 Free apps for Wisconsin crop production

by Roger Schmidt, IPCM computer specialist These five free apps help Wisconsin farmers and crop consultants quickly do calculations and find answers concerning crop and pest management. The apps all use University of Wisconsin science and research-based information sources. By … Continue reading

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Palmer amaranth confirmed glyphosate-resistant in Dane County, Wisconsin

Thomas Butts, a graduate research assistant, and Vince Davis report a new confirmation of a glyphosate-resistant weed in Wisconsin. Their full report is available here. For more information, please visit the WCWS documents page.

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Glyphosate resistance confirmed in two Wisconsin common waterhemp populations

Recently, Thomas Butts, a graduate research assistant, and Vince Davis confirmed two herbicide-resistant common waterhemp populations in Wisconsin. The full report is now available. For more information, please visit the WCWS documents page.

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Big weeds found at the Farm Technology Days event in Portage County

Mark Renz, Extension Weed Scientist Despite the cool summer we had plenty of weeds at the Weed Experts booth this past week.  Of the many samples brought in for identification eight participants submitted nine weeds they felt deserved the title … Continue reading

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Biggest Weed Contest at the Weed Doctor’s Booth at FTD

Mark Renz, UW-Madison Extension Weed Scientist What does a cold winter, a wet spring, and a moderate summer produce?  A bumper crop of big weeds!  Yes once again weed scientists with University of Wisconsin Extension are holding the biggest weed … Continue reading

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Bur and Wild Cucumber; Two Native Vines Common in Wisconsin

Mark Renz, Extension Weed Specialist, UW-Madison Now is the time of year when we start to notice vines climbing trees, crops, and even structures. While Wisconsin has over 50 plants categorizes as vines, bur (Sicyos angulatus L.) and wild (Echinocystis … Continue reading

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White tipped/bleached Canada thistle, a good thing

Mark Renz, University of Wisconsin Extension Weed Specialist Wet springs, bring good and bad things from a weed perspective. First the bad: we often see much more Canada thistle in our pastures, row crops, and roadsides in Wisconsin in wet … Continue reading

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Data suggests glyphosate resistance of two Wisconsin common water hemp populations

Thomas R. Butts and Vince M. Davis, Department of Agronomy, University of Wisconsin-Madison The two weed populations examined were collected from crop production fields in Eau Claire and Pierce counties. They were identified through the Late-Season Weed Escape Survey in … Continue reading

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