Aster Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Aster diseases.
Aster Diseases - Articles


Aster YellowsLeaves yellow. Abnormal branching occurs. Yellowed, leaf-like tissue forms instead of flower parts.PhytoplasmaDestroy infected plants. Maintain good leafhopper control. Destroy any similarly affected weeds in the vicinity.
Botrytis BlightBrown specks form on petals. The entire flower browns and dies.Botrytis cinereaAvoid sprinkler irrigation. Apply a fungicide to protect healthy tissue.
Fusarium WiltYoung seedlings are killed. Older plants are stunted and have yellowing and wilting up one side of the plant. Water conducting tissue in the stems browns.Fusarium oxysporumUse potting soil that has been treated to eliminate pathogens. Or, use soilless potting mix.
Leaf SpotsSpots form on leaves. Leaves Yellow, wilt, and die. Usually lower leaves are affected first and symptoms progress upward.Alternaria, Ascochyta, Cercospora, SeptoriaAvoid sprinkler irrigation. Apply a fungicide to protect healthy tissue.
Powdery MildewWhite felty growth develops on the surface of leaves. Leaves wither and die.Golovinomyces cichoracearum (formerly Erysiphe) Apply a fungicide to protect healthy tissue.
RustReddish-orange masses of spores form on the underside of leaves. Severely affected leaves yellow and die. On the alternate host, pines, blisters of spores form on needles in the spring.Coleosporium solidaginisNo control is recommended.