Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001044
11/12/99
PELARGONIUM DISEASE PROBLEMS - Outdoors
Bacterial leaf spot causes spots on the leaves of
garden plants, particularly if they are over crowded. The
spotting will be worse on the lower leaves. The spots are
small, circular or irregular, and brown and sunken. When
the spots run together a portion of the leaf is killed.
The entire leaf may turn yellow, then brown, then drop
off. Use proper spacings and pick off and destroy
infected leaves.
Blossom blight or gray mold (Vis. 1) causes flower petal
discoloration and flower drop. A gray mold may be seen on
the leaves.
Cuttings may be attacked by stem rot or blackleg. The
stems of cuttings turn black with rot. Use healthy
cuttings and sterile rooting media.
Bacterial fasciation causes formation of masses of short,
thick and aborted stems with misshapen leaves near the
soil line at the bottom two nodes. The plants are not
killed but will be dwarfed.
Related information.
Pesticide Recommendations
Fungal and Bacterial Leaf Diseases
Botrytis Blight
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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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