Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Cosmos > Discolored flowers
Cosmos > Flowers > Discolored flowers
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Aster Yellows
Phytoplasma
- Part or all of the leaves may turn yellow
- Flowers fail to develop, remain small green and may be distorted
- Clumps of weak shoots known as witches broom develop throughout the plant or on flower stalks
- More information on aster yellows
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Gray Mold
Botrytis cinerea
- Brown blossoms or petals; flowers drop off prematurely
- Leaves may turn completely brown and rotted
- Gray fuzzy mold develops on rotted tissue under humid conditions
- Disease develops during cool, wet weather
- More information on gray mold
