Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000433
11/12/99
CORYLUS DISEASE PROBLEMS
Crown gall, caused by Agrobacterium tumefaciens, causes
formation of roundish, warty-looking galls on the lower
stem near ground level. There is no satisfactory chemical
control. Avoid planting in infected soil.
Several fungi cause cankers and twig blight. The branch
dies when the stem is girdled. Prune out infected
branches below the point of infection.
Several genera of fungi cause leaf spots. Severe
infections may cause leaf drop.
Powdery mildew of different genera form a white coating on
the leaves. Severely infected leaves turn yellow and
fall.
Related information.
Pesticide Recommendations
Bacterial Crown Gall
Powdery Mildew
Fungal and Bacterial Leaf Diseases
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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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