New York AaBicuLTURAL Experiment Station. 633 



The brood which passes the winter in the pupa state can be 

 destroyed by plowing the ground deep enough to bury the puparia 

 to such a depth that it will be impossible for the flies to work their 

 way to the surface.* The latter method will do only a small amount 

 of good unless measures are taken to prevent the growth of lamb's- 

 quarters in uncultivated places and in cultivated fields after the 

 crops are "laid by." 



♦ SiDce the above was written actual tests have shown that this species of fly can work its 

 way through eight inches of dirt. The only gain of deep burying was to retard for several 

 weeks the time of (their appearance in the spring. F. A. S. 



