Potatoes are sensitive to residues left in the soil by a range of commonly used herbicides. These residues may alter the appearance of the foliage of the potato crop, interfere with normal root development, reduce crop yields and cause abnormalities in the harvested tubers. Herbicide carry-over is especially problematic in potato fields planted for use as seed, as the herbicides may impair the performance of the seed crop in the next growing season. The duration of time over which herbicide residues may remain at damaging levels in the soil is determined by the chemistry of the herbicide, the rate, timing and method of herbicide application, soil properties, tillage practices, and weather conditions in years following treatment. Repeated applications of the same herbicide or related products can result in cumulative effects.
The information provided in this document represents a guide only and reflects information available at the time of publication (February 2016). SSPGA takes no responsibility for any errors or omissions in the publication. Growers are urged to consult with extension staff and product manufacturers for more information on safe re-cropping intervals.