An updated version of the fact sheet “Herbicide Programs for non-GMO soybeans” is now available. A print ready version can be found here, and it’s also available on Ohioline here. The basic approach with herbicides has not changed much. Weed control in non-GMO soybeans can be challenging, and increases the selection for resistance to site 14 herbicides (fomesafen, Cobra). The new version emphasizes several things, including:
- Plant non-GMO soybeans in fields with a history of several years of crop rotation and effective weed control that has prevented weed seed return to the soil and reduced weed populations.
- Maintain a rotation where non-GMO soybeans are planted every four years, with two years of corn and one year of traited soybeans in between, or other crops as appropriate for the farm operation.
- Fall herbicide treatments should be used to manage marestail, winter annuals, dandelion, and other perennial weeds. Marestail can be especially difficult to control in no-till, non-GMO soybeans unless a fall herbicide treatment is used.
- Planting non-GMO soybeans in fields with waterhemp is not recommended due to the high frequency of resistance to ALS and PPO inhibitors, which eliminates all POST options for control.
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