Various publications available through agriculture extension specialists provide information on resistant varieties. Where practical, use of short season varieties may help reduce the period of use for fungicides. Avoid leaving tubers, including debris or slivers from seed cutting, in cull piles for any length of time. Avoid uncovered cull piles during the growing season. Check with local authorities for methods of disposal.
Scout fields to identify hot spots and other courses of disease.
No fungicide is effective in eradicating disease that has already set in. Attempting to use fungicides as curatives can promote the spread of fungicide resistance. Consult the current edition of the Guide to Crop Protection for recommended fungicides. Begin a fungicide program early in the season, always before disease develops, and continue through until harvest. Scouting programs, forecasts based on local weather conditions and stage of crop development should be used to determine when to begin applications and to adjust the timing of applications during the growing season.