Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001098
01/01/98

PICEA DISEASE PROBLEMS

Cytospora canker infects a branch then eventually kills     
it.  The lower branches are attacked first then             
progressively higher branches.  The needles turn brown to   
reddish brown and eventually drop off.  White resin         
patches are seen on infected branches.  Prune off infected  
branches.  Water spruces during dry weather.                

Spruce may be attacked by needle casts.  One, caused        
by Lophodermium piceae, causes needles to turn yellow or    
brown and drop off.  Another, caused by Rhizosphaera        
kalkhoffi, affects the lowest needles first then moves up   
the tree.  Infected needles are a mottled yellow.           

Several rust diseases attack spruce but these are rarely    
seen.  Infected needles turn yellow and drop off.           

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