442 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE LVI 



THE PIT-MAKlNa OAK SCALE 



(Astcrolccanium variolosum ) 



Fig. 1. — Oak twigs severely infested. The twig at the right is seen to be 

 rather deeply pitted where scales have been removed. 



Fig. 2. — An English oak, Eden Park, Cincinnati, Ohio, in a dying condition 

 from the work of the pit-making oak scale. 



