Bui 173, U. S Dept. of Agriculture. 



Plate III. 



Fig. 1.— Untreated Portion of Pear Orchard, Showing Loss of Pear Blossoms 

 Resulting from Attack of the Pear Thrips. (Original.) 



Fig. 2.— Sprayed Portion of Same Orchard, Showing Trees in Blossom. (Original. 

 INJURY TO PEAR ORCHARDS BY THE PEAR THRIPS. 



