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Herbicide Rotation Restrictions

Originally written by Gared Shaffer, former SDSU Extension Weeds Field Specialist.

Herbicides can persist and affect future crops. Many factors effect herbicide carry over; amount of moisture, soil PH, previous crop planted, soil texture, soil organic matter level, no-till, tillage, etc. When planning on rotating to another crop always check the product label first to look for rotation restrictions. This is a quick reference guide to common herbicides and their rotation restrictions for selected crops. Refer to label to see if field bioassays should be performed before planting rotation crops, especially for rotation intervals longer than 18 months.