464 OHIO EXPERIMENT STATION: BULLETIN 332 



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. 



