Bacterial soft rot causes a soft mushy rot at the base of the stems. The problem is most prevalent on overwatered plants. Keep plants watered properly and do not propagate from diseased plants.
Leaf spot symptoms are sunken reddish brown spots on the leaves. The spots have yellowish borders and may be up to 1/2 inch in diameter. The spots may extend all the way through the leaf then dry and fall out. If spots run together and girdle the leaf, it dies.
Wilt is a physiological problem caused by over fertilization.