Use disease-free seed. Grow plants in warmer fields, with good air and soil drainage. Avoid overhead watering. Crop rotations of at least 3 years away from all cucurbits is recommended. The fungus can survive at least three years in soil.
Resistance is available in cucumbers.
See current recommendations for chemical control measures. By Pamela S. Mercure, IPM Program Assistant, University of Connecticut, 1998. Sherf, A.F. and A. A. MacNab. Vegetable Disease and Their Control . John Wiley and Sons, New York.