Bui. 536, U. S. Dept of Agriculture. 



Plate XVIII. 



The Avocado or Alligator Pear as a Host of the Mediterranean Fruit Fly. 



Cross section of improved fruit. Note slight infestation at stem and blossom ends. In- 

 festation is not always general and usually does not interfere with local consumption. 

 The slight infestations, however, have forced this fruit into the quarantine list, 

 thereby ruining a profitable and growing export trade. (Original.) 



