Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Hardy Geranium > Spots on leaves
Hardy Geranium > Spots on leaves
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Fourlined plant bug
- Occurs May to early July
- Feeding causes brownish or sunken spot on leaves
- Nymphs are red or red and black; Adults are greenish yellow with 4 black stripes, 1/4 to 1/3 inch long
- More information on Fourlined plant bug
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Rust
Puccinia and Uromyces species
- Oval to round yellow leaf spots on the upper side of the leaf
- Mature leaf spots are brown or orange in the center with a yellow border
- Raised orange blisters on the underside of the leaf
- Powdery orange spores rub off of lower leaf surface and can be seen on a white tissue paper
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Powdery Mildew
Erysiphe cichoracearum
- Powdery, fluffy, white spots or blotches on leaves, stems and flower parts
- Tiny raised black dots may be visible within white spots late summer or early fall
- Spots typically start on lower leaves but can spread to cover the entire plant
- Severely infected leaves may be completely covered in white or grayish white fungi
- In some cases, leaves become curled or twisted or turn yellow due to the infection
- More information on Powdery Mildew
