It is within an infected root that additional oospores will be produced to overwinter another season. Although disease develops in less heavy soils, a heavy textured soil is favorable as they tend to remain wetter. The same is true for low parts of fields, heavily compacted areas, or at the bottom of hills.
It is within an infected root that additional oospores will be produced for the next winter season. Disease can occur in lighter soils, but a heavy-textured soil facilitates its development due to retained moisture. This is also true for low-lying areas, compacted regions, and hill bottoms.