Giant ragweed is a fierce competitor — as one of the tallest annual weeds, it is extremely competitive for light and very difficult to control in many broadleaf crops. Complicated further by its emergence throughout the growing season and tolerance to many management tactics, it's important to control this weed before it controls your fields.1,2,3
Giant ragweed is native to North America and commonly found throughout the United States.4,5,6
Just one plant per 110 square feet reduced soybean yields by 50% 2
to diversify herbicide programs and weed control strategies.
with a burndown herbicide or tillage.
using a residual product within 2 weeks before planting or prior to crop emergence.
before weeds grow taller than 4 inches.
If weeds escape, use tillage or physically remove them before plants produce seed.
The key to controlling giant ragweed is all about the right timing and the right products. Apply a postemergence herbicide 20-30 days after planting, when giant ragweed is less than 4 inches tall and easier to control. Choose the
right products with the right modes of action to give your crops the best defense against weeds:
With the right postemergence application, as part of a complete strategy, you can keep better control of weeds and help protect your crops to canopy.
Choose the system that gives you advanced weed control and yield potential.
1 Crop Science (Sep. 16, 2019). Ambrosia trifida. Retrieved from http://www.cropscience.bayer.com
2 Johnson, B., Loux, M., Nordby, D., Sprague, C., Nice, G., Westhoven, A., Stachler, J. (May 2007). Biology and management of giant ragweed. The Glyphosate, Weeds, and Crops Series. GWC-12. Retrieved from http://www.weedscience.missouri.edu
3 Crop Science (Sep. 17, 2019). How to manage and control ragweed in corn and soybeans. Retrieved from http://www.cropscience.bayer.us
4 Steckel, L, University of Tennessee Extension (June 2007). Giant ragweed. Retrieved from http://www.extension.tennessee.edu
5 University of Texas at Austin Lady Bird Johnson Wildflower Center Plant Database (Sep. 16, 2019). Ambrosia trifida. Retrieved from http://www.wildflower.org
6 Michigan State University (Sep. 17, 2019). Giant ragweed. Midwest Invasive Species Information Network. Retrieved from http://www.misin.msu.edu
7 Take Action. United States Soybean Board (Sep. 17, 2019). Giant ragweed. Retrieved from http://www.iwilltakeaction.com