Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001755
01/01/98

European Pine Sawfly

Pine sawflies are pests of pines.  They are often confused  
with moth larvae but the adult of these insects is more     
like a fly.                                                 

The insects overwinter as eggs that hatch out during  a     
two week period in early May.  The insects feed for 4 to 6  
weeks.  The insects pupate in litter beneath the tree or    
in protected sites on the lower trunk.  The adults emerge   
in early September to late autumn.  After mating the        
females lay eggs in slits in pine needles.                  

The insects eat the old needles but leave the new shoot     
alone.  The insects feed in colonies and when disturbed     
will bob up and down.                                       

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