Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000831
01/01/98

LARIX DISEASE PROBLEMS

Cankers of several types will infect larches.  These can    
not be controlled chemically.  Symptoms are sunken or       
discolored bark and dieback of the branches.  Prune out     
infected branches and fertilize to maintain tree health.    

Needle blight causes yellow spots on the needles.  The      
infected needles turn brown and hang on the tree.  The      
spur bearing the needles may be killed.  Gather up and      
destroy fallen needles to kill overwintering disease.       

Several rust diseases infect larch.  Alternate hosts        
are willow, poplar, and birch.  In landscapes, larch and    
an alternate host may be close.  Infected needles near the  
branch tips turn yellow.  Disease identification            
identifies the alternate host for possible removal.         

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