Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000611
11/12/99
FAGUS DISEASE PROBLEMS
Several fungi cause leaf spots but are generally not
sufficiently serious to warrant chemical control.
Powdery mildew causes a white coating on the leaves. The
disease is most common late in the season.
Bleeding canker, caused by the fungus Phytophthora
cactorum, forms cankers from which a brownish liquid
oozes. Crown symptoms include leaves of smaller size and
lighter green color than normal. In severe cases the
leaves wilt and the branches die. There is no chemical
control. Avoid feeding with high nitrogen fertilizers as
it seems to worsen the condition of infected trees.
Beech bark disease occurs when the feeding site of woolly
beech scale is invaded by the fungus Nectria coccinea var
faginata. The fungus kills the bark and in the process,
the insects. There are no satisfactory controls for the
fungus. Control the disease by controlling the scale.
Cankers infect, girdle, and kill branches. There is no
chemical control. Prune out the infected branches.
During periods of high temperatures and low rainfall
beech may scorch. Make sure trees are adequately watered.
Related information.
Pesticide Recommendations
Cankers
Powdery Mildew
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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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