Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001530
11/12/99
VIBURNUM DISEASE PROBLEMS
Bacterial leaf spot causes round, water-soaked spots on
leaves and young stems. These develop into shrunken,
brown areas about 1/8 inch in diameter.
Bacterial crown gall forms galls on the lower stems.
There is no chemical control. Remove infected plants and
do not replant in the same spot.
Shoot blight causes grayish to brown decayed spots on
the leaves. The spots first appear at the leaf margins,
then spread to the rest of the leaf. Infected flower
clusters or twigs are killed. The disease is caused by
Botrytis cinerea.
A number of fungi cause leaf spots. Rake up and destroy
infected leaves.
Powdery mildew causes a white powdery growth on the
leaves.
Related information.
Pesticide Recommendations
Fungal and Bacterial Leaf Diseases
Botrytis Blight
Powdery Mildew
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.