Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000325
11/12/99
CENTAUREA DISEASE PROBLEMS
Downy mildew causes pale greenish or reddish, irregular
spots on the upper sides of leaves. The undersides may be
covered with a soft moldy growth. Young plants are
especially susceptible. The disease is a bigger problem
in cool damp weather. Remove infected plants, use
adequate spacings and provide good light exposure and air
circulation.
The wilt which attacks China Aster also attacks Bachelor
Button. Plants affected at blooming time have pale,
yellowish-green leaves. The lower leaves wilt or plants
may develop a one sided wilt. A thin coating of rose or
pale pink spores are on the stem near soil level. Do not
compost diseased plants. No chemical control is
available.
Rusts attack Bachelor Button covering the leaves and
stems with brown pustules.
The verticillium wilt fungus infects the veins of the
plant causing death. Avoid infested soil and remove
diseased plants as they are seen.
Stem rot causes rotting of the lower stems then upper
portions of infected plants wilt and die. In wet weather,
a cobwebby growth develops on the lower stem. Both
seedlings and older plants are attacked.
Related information.
Pesticide Recommendations
This information is for educational purposes only. References
to commercial products or trade names does not imply
endorsement by MSU Extension or bias against those not
mentioned. This information becomes public property upon
publication and may be printed verbatim with credit to MSU
Extension. Reprinting cannot be used to endorse or advertise
a commercial product or company.
This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
For more information about this data base or its contents please contact
heatley@msue.msu.edu . Please read our
disclaimer for important
information about using our site.