Powdery mildew of Watermelon

Figure 1: Leaf lesions of powdery mildew of watermelon may be white due to the sporulation of the fungus or colonies on the reverse of the leaf may show up chlorotic.

Figure 2: Leaf with sporulation of powdery mildew.

Figure 3: Powdery mildew of watermelon fruit. W. Guan photo.

Figure 4: Powdery mildew on stem of watermelon.