Downy mildew of Watermelon

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

Figure 2: Chlorotic and necrotic lesions on watermelon leaf.

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

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