Key to Common Problems of Cucumbers (2024)

Small yellow-green or white spots on leaves (stippling)Leaves may eventually appear tattered, yellowSquash bugsCommonFine yellow or white spots (stippling)Leaf undersides may appear dirty. Mites can be seen on leaf undersides with the naked eye or hand lens

Spider mites

Common during extended hot, dry weatherPale yellow, tan, or gray spots on leaf surfacesSpots may be round or irregular, angular-shaped. Centers of the spots may drop out and leave ragged holesFungal and Bacterial Diseases
Anthracnose
Angular leaf spot
Target spotVery commonYellow, angular spots on upper leaf surface, with gray fuzzy spots on the undersidesStarts on older leaves in early to late summerDowny mildewCommonWhite powdery growth on leavesMay be on upper and lower surfaces; starts mid-summer on older leaves. Can spread rapidly, causing plants to yellow and diePowdery mildewVery CommonYellow or green patches (mottling) on the leavesLeaves may be distorted, deformed, or puckered. Leaves may curl upward or downwardViruses diseasesCommonBrown leaf edges, tan blotchesLeaves may have a scorched appearanceFertilizer or
pesticide burnOccasionalSmall holes in leaves; chewing damageChewing damage may also be on flowers, stems, and fruit; beetles with stripes or spots may be presentCucumber beetlesVery CommonChewing/etching of leavesChewed leaf tissue is between the leaf veins; visible on the underside

Squash beetles

OccasionalLeaves curling/cuppingLeaves curl downward, turn brown, and die. Aphids transmit viral diseases.AphidsCommonLeaves wiltingProgresses from single leaves to whole stems and whole plantBacterial wiltVery Common
Key to Common Problems of Cucumbers (2024)

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