|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.|
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