Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000172
11/12/99
ASTER DISEASE PROBLEMS
Leaf spot fungi cause spots of various types on the
leaves. The spotting may be worse in rainy seasons.
Downy mildew causes a downy mold on the lower leaf
surfaces but is not important on aster.
Powdery mildew develops on the lower parts of crowded
plants in late season. Symptoms are a whitish coating on
the leaves.
Bacterial crown gall causes the formation of rough,
rounded galls. The galls form near the soil surface.
Avoid infested soil and destroy infected plants. No
chemical control is available.
Verticillium wilt occasionally kills plants. No chemical
control is available.
Related information.
Pesticide Recommendations
Powdery Mildew
Bacterial Crown Gall
Verticillium Wilt
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This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
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