48H OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE LIV 



THE EUROPEAN ELM SCALE 



(Gossyjjaria ulmi) 



Tig. 1. — Adult female insects in position in their protecting waxy nests. 

 Slightly enlarged. 



Fig. 2. — The European elm scale in late spring. The louse-like objects 

 are the developing females and the cottony masses are the cocoons of the males. 



Fig. 3. — ^An elm tree. Marietta, Ohio, in a dying condition from an infesta- 

 tion of the European elm scale. 



