The anthracnose fungus overwinters on seed and on diseased crop refuse. Anthracnose on cucumber leaf. Photo by Clemson University. Anthracnose on muskmelon fruit. Anthracnose control is difficult once the disease is serious.
Preventive measures are important, including use of good quality seed and crop rotation.
Other fungicides are available for commercial growers. These are listed in the North Dakota Plant Disease Control Guide, available at county offices of the NDSU Extension Service or through Extension Plant Pathology at NDSU in Fargo. Angular Leaf Spot Angular leaf spot is a cucumber disease caused by the bacterium Pseudomonas lachrymans . The spots are restricted by the main veins. In rainy weather a creamy bacterial ooze forms in droplets on the spots.