Category Archives: Weeds

Glyphosate Resistance Confirmed in Common Ragweed from Columbia County, Wisconsin

Joe Zimbric, Graduate Research Assistant and Dave Stoltenberg, Professor, Department of Agronomy, University of Wisconsin-Madison The results of our experiments confirmed glyphosate resistance in the common ragweed population from Columbia County. The population showed a 4-fold level of glyphosate resistance based … Continue reading

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2018 UW Waterhemp Challenge: Comparison of Soil Residual Soybean Herbicides

by Rodrigo Werle (UW-Madison Extension Cropping Systems Weed Scientist), Dan Smith (UW NPM Southwest Wisconsin Regional Specialist) and Richard Proost (UW NPM Sr. Outreach Specialist) Waterhemp management in soybeans was a challenge for several farmers in 2018. As we finalize … Continue reading

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Herbicide Site of Action Key for Crop Injury Symptoms

by Rodrigo Werle (UW-Madison Extension Cropping Systems Weed Scientist) and Maxwel Oliveira (UW-Madison Weed Science Postdoctoral Research Associate) With the widespread occurrence of herbicide-resistant weeds, corn and soybean farmers are having to diversify their herbicide programs to obtain adequate levels of weed control. … Continue reading

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Send in Waterhemp Seeds for Free Herbicide Resistance Screening

Wisconsin Waterhemp Herbicide Resistance Project by Rodrigo Werle, UW-Madison Extension Cropping Systems Weed Scientist According to our recent SURVEY, waterhemp has become the most concerning weed in row crop production in Wisconsin. Thus, we invite Wisconsin farmers and agronomists to … Continue reading

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Survey seeks Wisconsin soybean farmers’ perceptions on dicamba

Dicamba Use in Wisconsin Soybean Production – SURVEY by Rodrigo Werle (UW-Madison Extension Cropping Systems Weed Scientist) In 2017 the Xtend soybean technology was completely launched in the United States (e.g., Environmental Protection Agency [EPA] approval of dicamba-tolerant seed trait … Continue reading

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Update on Waterhemp and Palmer Amaranth in Wisconsin

Waterhemp and Palmer Amaranth in Wisconsin: an update on locations and call to report new infestations. Mark Renz, UW Madison Associate Professor and Extension Specialist We have been observing the continued spread of waterhemp and Palmer amaranth in Wisconsin. These … Continue reading

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Reporting Dicamba-Injured Acreage in Wisconsin

by Rodrigo Werle (UW-Madison Extension Cropping Systems Weed Scientist) At the beginning of July, the weather finally became conducive for POST-emergence herbicide applications in southern Wisconsin, including for dicamba application in Xtend (dicamba-tolerant) soybeans. Typically, injury from micro-rates of dicamba (via tank-contamination, … Continue reading

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Geographic Restrictions for Corn and Soybean PRE-emergence Herbicides in Wisconsin

Rodrigo Werle (UW-Madison Extension Cropping Systems Weed Scientist) RE-emergence herbicides are the foundation for good weed control in corn and soybeans, particularly with the spread of herbicide-resistant weeds. The use of some PRE-emergence herbicides is limited to certain regions or … Continue reading

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Wisconsin Herbicide Mode of Action Chart

Daniel H. Smith- Nutrient and Pest Management Program, University of Wisconsin-Madison The Nutrient and Pest Management and the Wisconsin Cropping Weed Science programs have recently updated the Wisconsin herbicide mode of action chart. This publication provides herbicide mode of action, group … Continue reading

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2018 Wisconsin Cropping Systems Weed Science Survey- Results

Rodrigo Werle (UW-Madison Extension Cropping Systems Weed Scientist) and Maxwel Oliveira (UW-Madison Weed Science Postdoctoral Research Associate) The objective of our survey was to evaluate the main weed species and management strategies adopted in Wisconsin cropping systems, particularly in corn … Continue reading

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