Herbicide resistance is a widespread problem in the United States. More than 70 unique weed species have developed herbicide resistance to at least one of 14 different groups of herbicides. And, once resistance develops, plants remember that they' re resistant for as long as they're in the soil.
Weeds most likely to develop herbicide resistance tend to:
- Exhibit broad genetic diversity
- Produce large amounts of seed
- Germinate through a longer period of the growing season
- Survive or thrive in poor growing conditions
Key weeds developing resistance in corn and soybean fields over a broad
area of the Corn Belt:
- Waterhemp
- Pigweed species
- Lambsquarters
- Horseweed (marestail)
- Velvetleaf
- Giant ragweed
- Common ragweed
- Glyphosate-tolerant volunteer corn
Probable resistant weeds by 2010–2015:
- Foxtail
- Barnyardgrass
- Johnsongrass
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