Articles

Aster Diseases

Name: Aster Diseases
SKU: ART-3284

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

Updated:

November 27, 2023

Disease	Symptoms	Pathogen/Cause	Management
Aster Yellows	Leaves yellow. Abnormal branching occurs. Yellowed, leaf-like tissue forms instead of flower parts.	Phytoplasma	Destroy infected plants. Maintain good leafhopper control. Destroy any similarly affected weeds in the vicinity.
Botrytis Blight	Brown specks form on petals. The entire flower browns and dies.	Botrytis cinerea	Avoid sprinkler irrigation. Apply a fungicide to protect healthy tissue.
Fusarium Wilt	Young 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 oxysporum	Use potting soil that has been treated to eliminate pathogens. Or, use soilless potting mix.
Leaf Spots	Spots form on leaves. Leaves yellow, wilt, and die. Usually, lower leaves are affected first and symptoms progress upward.	Alternaria, Ascochyta, Cercospora, Septoria	Avoid sprinkler irrigation. Apply a fungicide to protect healthy tissue.
Powdery Mildew	White felty growth develops on the surface of leaves. Leaves wither and die.	Golovinomyces cichoracearum (formerly Erysiphe)	Apply a fungicide to protect healthy tissue.
Rust	Reddish-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 solidaginis	No control is recommended.