The scurf fungus only attacks underground portions of sweetpotatoes. It does not attack other crops. The fungus will survive in field or plant bed soils. Scurf is usually worse during rainy seasons. Scurf Management A. Set healthy plants.
Certified seed is the best source of disease-free plants.
Carefully select seed for bedding. Whether certified seed is used or not, every root should be inspected when selected. Wetting the roots makes scurf spots easier to see. Treat the seed before bedding. Unseen contaminating spores can be killed by dipping the roots in a fungicide.