Weeds

Learn more about problem weeds in Iowa, utilizing different management tactics to help control problem weeds, and more about how to minimize the spread of herbicide resistance.
Tools and Resources
- All Weeds and Weed Control Publications
- Herbicide Options for Palmer Amaranth in CRP
- Iowa's Noxious Weed Law: Chapter 317
- Palmer Amaranth Identification
- Weed Identification Fact Sheets
- Weed Identification Field Guide 2nd Edition
- 2025 Herbicide Guide: Iowa Corn and Soybean Production
- Weed Content Index
Timely Insights on Weeds
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May 23, 2025Content Author
Maintaining healthy pastures is critical for supporting livestock productivity and forage quality. But weeds can threaten those goals by outcompeting desirable species, reducing grazing efficiency, and in some cases, posing toxicity risks to animals.
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May 15, 2025Content Author
You won’t want to miss any of the upcoming field days hosted at the outlying Iowa State University Research Farms this summer. These field days will feature the latest information on crop production and management practices. Below is a list of the upcoming field days that will take place as well as what topics will be featured at each field day. All field days are of no cost to attendees and open to the public.
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May 14, 2025Content Author
Each year brings fresh concerns related to herbicide performance and the weather. We can’t control the weather, and we are often at the mercy of wind, temperature, and moisture whether there is too much, too little, or ideally, just right. A recurring concern this spring has been dry weather and how it impacts herbicides.
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May 2, 2025Content Author
Rain and wind has impeded getting fieldwork done this spring, but it looks like the weather forecast is heading for drier conditions. This will allow farmers to get the remaining corn and soybean fields planted across Iowa prior to when yield potential starts to drop off in mid-May. The latest USDA Crop Progress Report estimates that 34% of our corn is planted and 25% of the soybean crop is planted.
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April 28, 2025Content Author
Are you a crop scout, or interested in honing in on your crop scouting skills? Join us for our Crop Scout School on May 22, 2025 at the ISU Southeast Research and Demonstration Farm near Crawfordsville (3115 Louisa-Washington Rd). Check-in begins at 8:30 a.m., and the program runs from 9:00 a.m. to 3:30 p.m.