Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000424
11/12/99
CORNUS DISEASE PROBLEMS
Most of the diseases listed are seen most often on Cornus
florida. However, other dogwoods are susceptible to the
diseases listed.
Early symptoms of crown canker are smaller and paler
leaves. Leaves on infected branches turn red earlier in
the fall. At first the symptoms appear only on the
infected side of the tree but become more general as the
canker enlarges. There is no chemical control for the
disease. Avoid trunk wounds during and after planting.
Flower and leaf blight caused by Botrytis cinerea attacks
fading bracts, especially during wet weather. Infected
flower parts fall on the leaves spreading the infection.
A large number of leaf spots attack dogwood. Clean up and
dispose of infected leaves.
Powdery mildew coats the leaves with a fine white coating.
Leaf scorch occurs during hot, dry, windy weather. This
condition looks like a disease. Scorch symptoms are
drying and browning of the leaf margins, or, in more
serious cases, drying and browning of the interveinal
area.
Related information.
Pesticide Recommendations
Cankers
Powdery Mildew
Fungal and Bacterial Leaf Diseases
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.