Environment
Aphanomyces is a soil-borne disease, and the entire lifecycle is completed in the host root and surrounding soil. The pathogen A. euteiches does best in warm, wet soil conditions, but can survive at a range of moderate temperatures. Infection is most prevalent when host plants are in the seedling stage, and when temperatures are between 22-28 degrees Celsius. Because zoospores require water for mobility, standing water in the soil increases host infection by making it easier for zoospores to move to host cells. After infection, though, the development of symptoms is favored by warm and dry soil conditions.
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