Bui 173, U. S Dept. of Agriculture. 



Plate III. 



i 



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

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



h 



hi 



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

 INJURY TO PEAR ORCHARDS BY THE PEAR THRIPS. 



