Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001034
11/12/99
PAPAVER DISEASE PROBLEMS
Bacterial blight cause water-soaked spots on stems leaves
and flowers. These later turn black. The plants are
defoliated and are killed when stems are girdled.
Infected flowers have blackened sepals and the petals fail
to develop. A slimy exudate may form. The spots are
scattered, circular and surrounded by yellow tissue which
later turns brown. Destroy infected plants and do not
plant poppies in the same area.
Downy mildew causes pale spots on both sides of the
leaves. The spots are covered by white or grayish mold.
The stems are distorted and the blossoms fail to develop.
As the stem bases are infected the plant collapses. Pick
off infected leaves.
Powdery mildew causes a white powdery growth on the
leaves.
Verticillium wilt decline and death of the plants. No
chemical control is available for this disease.
Related information.
Pesticide Recommendations
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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