Pythium Root Rot
Pythium Root Rot (Pythium spp.) is similar to Rhizoctonia in that it causes damping-off of seedlings and foot rot of cuttings.
However, infection occurs in cool, wet, poorly-drained soils, and by overwatering. Infection results in wet odorless rots.
When severe, the lower portion of the stem can become slimy and black. Usually, the soft to slimy rotted outer portion of the root can be easily separated from the inner core. Species of Pythium can survive for several years in soil and plant refuse.