The definition of stem rot is "A symptom or phase of many diseases of plants characterized by decay of the stem tissue" and in most cases is caused by these soil inhabiting fungi.
- Rhizoctonia
- Fusarium
- Pythium
Plants showing signs of stem rot will have spots near the stem or on the roots near the soil level. These spots will vary in color and sizes. Spots on the stem or root may be gray, brown, black, or even bright red!
To avoid and/or treat root or stem rot be sure not to over water your plants. Try to keep base of the stem in dry conditions. Do not fertilize during hot, dry conditions. Mulch and aerate the soil. There are also multiple fungicides available. With a little research it easy to find what you need for your certain growing conditions.