The most serious disease on china aster is fusarium wilt. The disease may develop shortly after plants are set out or when they are full grown. The leaves become yellowish and the lower leaves wilt. Pink spores may be found on stems at, or just below, the soil level. The plant may show one sided development. Do not compost diseased plants and use resistant cultivars.
Root rot causes stems and roots to appear watersoaked and black. Do not compost diseased plants and do not replant china aster in the same spot. No chemical control is listed.
A rust disease causes bright yellowish orange spots on the undersides of leaves. This disease will be rare in most home gardens. No chemical control is listed.
Gray mold causes blossom blight under cool moist conditions. Remove and destroy infected plants and plant parts. Use benomyl according to label directions.
Several leaf spots may attack China Aster. No chemical controls are listed.
Aster yellows is transmitted by insects feeding on diseased plants then inoculating healthy plants. The leaves and affected blossoms are yellowish and branches form in the leaf axils. The plants rarely die but infected plants are a source of the disease organism. Control leafhoppers and remove infected plants as they are noticed. No chemical control is available for this disease.
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