Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000254
11/12/99

CALLISTEPHUS DISEASE PROBLEMS


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 available.

A rust disease causes bright yellowish orange spots on the
undersides of leaves. This disease will be rare in most
home gardens.

Gray mold causes blossom blight under cool moist
conditions. Remove and destroy infected plants and plant
parts.

Several leaf spots may attack China Aster.

Aster yellows is transmitted by insects feeding on
diseased plants then inoculating healthy plants when
feeding on them. The leaves and affected (Vis. 2) blossoms
are yellowish and branches form in the leaf axils (Vis. 1).
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.

Related information.
Pesticide Recommendations
Botrytis Blight


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