The application of fungicidal sprays, such as Bordeaux, at intervals throughout the growing season, may be helpful.
fungicide fun·gi·cide (fŭn'jĭ-sīd', fŭng'gĭ-)
A chemical substance that destroys or inhibits the growth of fungi.
A pesticide used to kill fungi, especially those that cause disease. Streptomycin is a fungicide. Compare herbicide, insecticide, rodenticide.