Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000209
01/01/98

BERBERIS DISEASE PROBLEMS

Bacterial leaf spots are first small and dark green and     
appear water-soaked.  Later the spots turn purplish-brown.  
Leaf stalks and new growth may also be attacked.            
Infection of older twigs results in dieback.  Prune out     
and destroy infected twigs.                                 

Anthracnose caused by Gloeosporium berberidis is sometimes  
listed as a leaf spot.  Symptoms are round, brown spots     
with reddish margins on the upper leaf surface.  Another    
fungus, Phyllosticta berberidis, causes purple spots on     
the leaves.                                                 

Powdery mildews of different genera cause a white coating   
on the leaves.                                              

Verticillium wilt causes wilting and eventual death.        
Nothing can be done but to keep plants healthy by watering  
and fertilizing.  Severely infected plants do not recover.  

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