Spray with recommended fungicides to prevent spread. Water by irrigating surface of soil rather than wetting the foliage. Take cuttings only from healthy plants. Plants may be stunted and even killed. Propagate from healthy plants or grow from seed.
Control insects that carry the fungus spores from one plant to another.
Plants should be spaced so that they have plenty of air. Avoid wetting the foliage when watering. Keep greenhouse temperature above 70 degrees F for several days and not below 60 degrees F at night. Where foliage is wet when watering, spray at weekly intervals with recommended fungicide. Good coverage is necessary for best results.