464 OHIO EXPERIMENT STATION: BULLETIN 331 



PLATE LXVII 



Fig. 1. The Maple Borer (Synanthedon acerni). A branch split open to 

 show the work of the borer and the rot which follows to further weaken the 

 host. 



Fig. 2. The outside appearance of a branch of maple attacked by the 

 maple borer. Note the enlargement of the branch and the killing of the bark, 

 which allows rots to become established. 



Fig. 3. The Carpenter Worm (Prionoxystus robiniae). An adult female 

 moth somewhat enlarged. 



