With corn  and soybean harvest  underway in all major producing states, farmers are thinking about herbicide  applications this fall. Aside from weed management, there are other factors to be considered when applying herbicide after harvest including: spring weather uncertainty, impact on soil conditions, pest interactions.
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1. Spring weather uncertainty: The probability of suitable field work days in the spring is smaller than in the fall, according to research by the University of Missouri.
2. Soil conditions: Removal of winter annual weeds with fall herbicide applications can have a significant impact on the soil conditions experienced at planting.
3. Pest-weed interaction: Another significant issue to consider when thinking about fall herbicide applications is that many winter annual weeds can serve as alternate hosts for soybean cyst nematode (SCN).
4. Weed management: Not all fall herbicide applications are created equal, says MU. And you shouldn’t expect control of summer annual weeds with a fall herbicide application.
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