Grow Mediums Root Rot -Pythium Information links you should read.

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Root rot is more common than most people believe. It is a diffult infection to treat, prevention is the best course. These link give in depth information on the disease and treatment. Hope this helps those who think they have, or have had, stem rot/root rot

http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/pythium

http://www.igrowhydro.com/InfoSheets/InfoSheet-HealthyRoots.pdf