Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Aster > Spots on leaves
Aster > Spots on leaves
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Rust
Coleosporium asterum and several species of Puccinia
- Raised orange spots on the underside of leaves and along stems
- Faint yellow spots on upper side of leaves
- Powdery orange spores rub off of infected leaves and can be seen with a white tissue paper
- Older infected leaves on lower part of the plant turn brown and dry up
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Powdery Mildew
Erysiphe cichoracearum
- Powdery, fluffy white spots and blothces on leaves, stems, and flower parts
- Tiny black round spheres may be visible within white spots late in the season
- 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
