6 



CIRCULAR. 2 



U.S. DEPARTMENT OE AGRICULTURE 



percent of the larvae in 764 cocoons, collected at two points in 1930, 

 the year after the first flies were liberated, were parasitized, whereas 

 the following year (1931) 1.901 cocoons were collected from points 

 where flies had been put out either 1 or 2 years before, and 8.57 

 percent contained parasitized larvae. Collections made a year later. 



Figure 5. — Pear trees (in foreground) and cherry tree (in background) defoliated by the 



oriental moth. 



during the winter of 1931-32. and totaling 2.498 cocoons, gave a per- 

 centage of parasitization of 16.49: and the following winter (1932- 

 33), of 2.235 cocoons collected. 52.43 percent contained parasitized 



larVae - CONTROL 



Field and laboratory experiments conducted in 1932 indicate that 

 the larvae of the oriental moth can be controlled satisfactorily bv 



