Causal Agent:
Pythium ultimum and sometimes other Pythium species.
Biology:
Wide host range including many crops. Infection of tubers occurs at wounds.
Dispersal:
Infection can spread from tuber to tuber during harvest and handling. Infected seed can also spread the pathogen.
Fungicide Resistance:
Pythium has begun to demonstrate resistance to fungicides.
Management:
Further Reading:
Pacific Northwest Pest Management Handbooks