Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001194
11/12/99
PRUNUS DISEASE PROBLEMS
Peach leaf curl, caused by Taphrina deformans, can attack
flowering peach. The leaves have red, curled, and
distorted areas.
The bacterium Xanthomonas pruni causes leaf spot and
twig cankers on cherry. Small, reddish spots dry, and
drop out, giving a shot holed appearance. Defoliation can
be severe when conditions favor disease development.
Fertilize infected trees and prune out infected branches.
Coccomyces hiemalis causes reddish spots which drop out
leaving shot holes. Once the holes appear the leaves may
drop. The disease is worse in wet weather.
Black knot causes black swellings (Vis. 1) or galls on the
branches. Branches with galls are pruned out.
Powdery mildew causes a white coating on the leaves.
Yoshino cherry may be subject to witches broom caused
by Taphrina cerasi. Branches are deformed and clusters of
small branches form. Infected branches bloom and leaf out
earlier. Brooms are pruned out.
Related information.
Pesticide Recommendations
Fungal and Bacterial Leaf Diseases
Black Knot
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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