According to Wisconsin farmer, waterhemp (Amaranthus tuberculatus) continues to be the most difficult-to-control and concerning weed species in Wisconsin corn-soybean production systems. This summer UW-Extension staff received several calls regarding lack of complete post-emergence waterhemp control with Callisto and/or dicamba in corn and with Enlist One in soybean. As harvest approaches, farmers are being asked by to help test actual waterhemp seeds for keys on why they're resistant.

Dr. Rodrigo Werle, UW-Extension Weed Scientist, is leading the effort with support from the Wisconsin Soybean Marketing Board and the Wisconsin Corn Growers Association.  There is no cost to producers for their participation, but there are specific guidelines they must follow.

Pam Jahnke visits with Werle who says his piers in other states are facing the same challenge.

If you would like to participate in collecting waterhemp seeds on your farm, just follow the link.

There is no cost associated with the herbicide resistance screenings. The only cost will be your time to collect the seed samples and mail them to:
Rodrigo Werle, 1575 Linden Drive, Madison, WI 53706

Please download and print the SEED COLLECTION FORM (PDF file) for information on how to collect the waterhemp seeds and fill out the information necessary for the project for each field. Please submit the form with the seed sample. Samples will only be included in the herbicide resistance screening if the information requested in the SEED COLLECTION FORM is provided.

We anticipate the preliminary herbicide resistance screening results will be available in the fall of 2024 (it takes ~6 months to screen samples for herbicide resistance in the greenhouse and we typically start our screenings after March when environmental conditions in our greenhouses are appropriate for waterhemp growth).

For questions, please contact Dr. Rodrigo Werle via e-mail: rwerle@wisc.edu.

According to Wisconsin farmer, waterhemp (Amaranthus tuberculatus) continues to be the most difficult-to-control and concerning weed species in Wisconsin corn-soybean production systems. This summer UW-Extension staff received several calls regarding lack of complete post-emergence waterhemp control with Callisto and/or dicamba in corn and with Enlist One in soybean. As harvest approaches, farmers are being asked by to help test actual waterhemp seeds for keys on why they're resistant.
Dr. Rodrigo Werle, UW-Extension Weed Scientist, is leading the effort with support from the Wisconsin Soybean Marketing Board and the Wisconsin Corn Growers Association.  There is no cost to producers for their participation, but there are specific guidelines they must follow. Pam Jahnke visits with Werle who says his piers in other states are facing the same challenge.
If you would like to participate in collecting waterhemp seeds on your farm, just <a href="https://wiscweeds.info/posts/2023waterhempresistancescreening/">follow the link</a>.
There is no cost associated with the herbicide resistance screenings. The only cost will be your time to collect the seed samples and mail them to:
<ul>
<li>Rodrigo Werle, 1575 Linden Drive, Madison, WI 53706</li>
</ul>
Please download and print the <a href="https://wiscweeds.info/posts/2023waterhempresistancescreening/2023%20WiscWeeds%20Waterhemp%20Seed%20Project.pdf" data-saferedirecturl="https://www.google.com/url?q=https://wiscweeds.info/posts/2023waterhempresistancescreening/2023%2520WiscWeeds%2520Waterhemp%2520Seed%2520Project.pdf&amp;source=gmail&amp;ust=1697213715123000&amp;usg=AOvVaw09z8sz5AUPqpcWuljD9dZ5"> SEED COLLECTION FORM (PDF file)</a> for information on how to collect the waterhemp seeds and fill out the information necessary for the project for each field. Please submit the form with the seed sample. Samples will only be included in the herbicide resistance screening if the information requested in the <a href="https://wiscweeds.info/posts/2023waterhempresistancescreening/2023%20WiscWeeds%20Waterhemp%20Seed%20Project.pdf" data-saferedirecturl="https://www.google.com/url?q=https://wiscweeds.info/posts/2023waterhempresistancescreening/2023%2520WiscWeeds%2520Waterhemp%2520Seed%2520Project.pdf&amp;source=gmail&amp;ust=1697213715123000&amp;usg=AOvVaw09z8sz5AUPqpcWuljD9dZ5"> SEED COLLECTION FORM</a> is provided.
We anticipate the preliminary herbicide resistance screening results will be available in the fall of 2024 (it takes ~6 months to screen samples for herbicide resistance in the greenhouse and we typically start our screenings after March when environmental conditions in our greenhouses are appropriate for waterhemp growth).
For questions, please contact Dr. Rodrigo Werle via e-mail: <a href="mailto:rwerle@wisc.edu">rwerle@wisc.edu</a>.

Join Pam Jahnke for the latest farm news. Heard daily on WOZN 96.7 FM and 1670 AM in Madison Wisconsin from 5-6am. Also heard on affiliate stations all over Wisconsin.

Join Pam Jahnke for the latest farm news. Heard daily on WOZN 96.7 FM and 1670 AM in Madison Wisconsin from 5-6am. Also heard on affiliate stations all over Wisconsin.

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