Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001034
01/01/98

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.             

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