Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000433
01/01/98

CORYLUS DISEASE PROBLEMS

Crown gall, caused by Agrobacterium tumefaciens, causes     
formation of roundish, warty-looking galls on the lower     
stem near ground level.  There is no satisfactory chemical  
control.  Avoid planting in infected soil.                  

Several fungi cause cankers and twig blight.  The branch    
dies when the stem is girdled.  Prune out infected          
branches below the point of infection.                      

Several genera of fungi cause leaf spots.  Severe           
infections may cause leaf drop.                             

Powdery mildew of different genera form a white coating on  
the leaves.  Severely infected leaves turn yellow and       
fall.                                                       

Cosmos sulphureous--Orange Cosmos                           

Height: 36 in   Spacing: 18 in                              
Type: annual                                                
Flowers: Orange, yellow                                     

Comments: Orange Cosmos tends to be somewhat shorter and a  
bit more sturdy than its relative.  Taller varieties will   
still tend to sprawl.  Provide a sunny exposure.            

Propagation: Propagation is by seed.  These can be planted  
directly into the garden after the danger of frost has      
passed.                                                     

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