Downy mildew of Watermelon – Vegetable Crops Hotline

Downy mildew of Watermelon

Downy mildew of watermelon, chlorotic lesions.

Figure 1: Chlorotic lesions of downy mildew on a watermelon leaf. Note that a few of the lesions are starting to become necrotic.

Downy mildew of watermelon, chlorotic and necrotic lesions.

Figure 2: Chlorotic and necrotic lesions on watermelon leaf.

Underside of watermelon leaf with downy mildew.

Figure 3: Underside of watermelon leaf with downy mildew. Note sporulation of downy mildew-see red arrows.

Severe downy mildew of watermelon.

Figure 4: Severe outbreak of downy mildew on watermelon. Note that stem and fruit of watermelon are not directly affected.

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