Centers of the spots fall out under wet conditions. Pseudomonas cichorii Avoid overhead watering. Discard infected plants. Pythium Root Rot Cuttings have poor root systems and yellow leaves. Leaves of established plants yellow and die.
Stems have a mushy black rot.
Pythium Plant in a potting mix free of pathogens. Apply metalaxyl, mefenoxam, fosetyl-Al, or etridiazole to protect healthy plants. Rhizoctonia Stem Rot Stems at the soil level are killed. Under wet conditions, a fine webbing of fungal growth can be observed on the soil surface near the infected stems. Rhizoctonia Plant in a potting mix free of pathogens.