Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000449
11/12/99
COTONEASTER DISEASE PROBLEMS
Leaf spots are a rare problem caused by one of several
fungi.
Cankers or twig blights are caused by fungi in the genera
Physalospora, Diplodia and Gibberella. When a canker
girdles the stem, the growth beyond the point of infection
dies. There is no chemical control. Prune out the
infected stems.
Cotoneasters are susceptible to fire blight, though C.
adpressa is reportedly resistant. There is no chemical
control for the disease. The disease kills the branch
tips and the leaves appear scorched. Prune out infected
twigs and avoid using high nitrogen fertilizer.
Related information.
Pesticide Recommendations
Cankers
Bacterial Blights
Fungal and Bacterial Leaf Diseases
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endorsement by MSU Extension or bias against those not
mentioned. This information becomes public property upon
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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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heatley@msue.msu.edu . Please read our
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