powdery mildew of cantaloupe

This disease is relatively common, but host resistance and systemic fungicides are available for management. The disease may be recognized by the talc-like growth on the upper and lower surfaces of leaves.  

Figure 1. Colonies of powdery mildew are visible on the upper surface of this cantaloupe leaf. Figure 1. Colonies of powdery mildew are visible on the upper surface of this cantaloupe leaf.
Figure 2. Sporulation of the powdery mildew fungus is visible on the lower surface of a cantaloupe leaf. Figure 2. Sporulation of the powdery mildew fungus is visible on the lower surface of a cantaloupe leaf.