Target spot can cause major damage on cucumber. The symptoms start as small round lesions on older leaves.

The lesions can expand to form large necrotic sections. The center of lesions may fall of giving it a shot hole appearance.

The disease is rarely seen on watermelon. Symptoms are round or marginally irregular leaf lesions leading to blighting.

The lesions can expand to a large size and the center may fall off giving it a shot hole appearance.

The disease can also be rarely seen on pumpkin with early symptoms similar to that on cucumber and watermelon.

The round lesions may be surrounded with a large yellow halo region on pumpkin leaves.

The pathogen conidia (spores) are airborne and can survive on plant material. The disease typically starts inside the canopy.