02 



DIPTERA OF MINNESOTA. 



3. All screenings and litter about the threshing machine should 

 be cleaned up, and either fed immediately or burned, leaving no 

 litter from the threshing in the field. There is no absolute need of 



Fig. 49. Three iU 



^.1 the Hessian Fly; "flaxseeds" exposed in two straws 

 at right. Original. 



burning the straw pile. The flies emerging from "flax seed" in the 

 center of the pile will never reach the surface. 



