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Water-soaked black and brown spots on plant leaves and stems often indicate a fungal or bacterial disease is the problem. Adjust the watering schedule and do not allow plants to sit in excess water.

QUESTION: We have a tropical corn plant, with three main stalks. We have had the plant for about six years, and it has doubled in height since we received it.

During wet and humid weather conditions, irregular light brown spots appear on the leaves from May through August. When these sunken reddish areas develop and grow together, they kill the leaves.