Spreading of Late Blight Inoculum is produced on volunteer plants or from cull piles or infected seed.
Infected plants produce spores that can be carried in moist air for up to several miles.
Plant only certified seed. Select fields for planting potatoes having good water infiltration and drainage characteristics. Do not plant potatoes in areas of fields where plants cannot be sprayed with fungicide. Consider not planting the area under the first few nozzles of a center pivot system where plants remain wet for extended periods. During Planting Do not mix seed lots to avoid possible contamination of healthy seed by infected seed.