Could be damping-off, it's fungal and fatal.

Post pics.
stinkyattic Reviewed by stinkyattic on . problems with stem hey i have 2 seedlings and on one of the seedlings, the lower part of the stem is turning yellowish while the top part is still green. On the other seedling, on the middle/top of the stems, there are some browning. whats causing this? Rating: 5