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Brown Spots on Cucumber Leaves
Brown Spots on Cucumber Leaves. The cucumber normally produces well in the home garden, according to the University of Illinois Extension. Brown spots on cucumber leaves indicate the presence of some type of disease. You must first identify the disease in order to eradicate the problem.
The cucumber normally produces well in the home garden, according to the University of Illinois Extension. Brown spots on cucumber leaves indicate the presence of some type of disease. You must first identify the disease in order to eradicate the problem.
Leaf Spot
Leaf spot is a bacterial disease resulting in brown spots that eventually fall out of the leaf. The disease often progresses to the cucumber fruit, causing rotting.
Alternaria
A fungus called Alternaria causes leaf blight in cucumber plants. Plants develop brown spots that are often surrounded by a light yellow coloring. This disease is rare in cucumber plants, according to Cornell University.
Anthracnose
Cucumber plants suffering from this fungus develop tan or brown spots with light centers. Spots appear on the stems and fruit of the plant.
Downy Mildew
Distinguish downy mildew from other diseases with common signs by the more angular brown spots present with this disease. Early signs include light green or yellow areas on the upper surface with leaves later turning brown.
Crown Rot
Phytophthora crown rot shows itself as dark brown spots on the leaves of cucumber plants. Plants more often exhibit overall decline and rotting fruit rather than brown spots.
