Compost suppresses Pythium ultimum

In controlled studies, soil amended with 20% compost consistently suppressed Pythium ultimum, a soil dwelling pathogen that is part of the disease complex black root rot.  Cucumber seeds are highly susceptible to P. ultimum and were used as indicators of suppression.  Percent germination of seedlings suggests the level of suppression achieved by each treatment.  Soil amended with compost achieved approximately 70% germination, compared to the unamended soil at 33% germination.  Screen Shot 2015-02-05 at 9.21.36 AM