Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000742
11/12/99
HYACINTHUS DISEASE PROBLEMS
Yellow rot causes yellowish water-soaked stripes extending
downward from the leaf tips. The stripes turn brown and
the leaves die. Infected flower stalks appear water-
soaked and become brown and shriveled. The bulbs will
decay. A stem cross section shows masses of yellowish
slime, oozing from the conducting tissue. Destroy
infected plants.
Black slime causes yellowish leaves which wither and
are easily detached from the bulbs. The bulbs
disintegrate. Avoid infested soil.
Root rot causes dwarfed plants that flower poorly. The
roots are decayed and the basal plate destroyed. Discard
infested bulbs. No chemical control is listed for this
disease caused by a Fusarium sp. fungus.
Gray mold causes discolored leaves which become shrunken,
rotted and covered with gray mold. The blossoms are
rotted in cold wet weather. Don't work in the plants when
the soil is wet. Destroy diseased blossoms. The disease
is caused by Botrytis cinerea.
Mosaic causes blue green mottling, streaking or blotching
of leaves. The few flowers produced wilt. Destroy
infected plants and control insects which spread the
disease.
Related information.
Pesticide Recommendations
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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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