WHEAT 



217 



In winter wheat regions damage by the Hessian Fly 

 may often be prevented by late seeding, although the 

 time when this is effect- 

 ive varies with the lo- 

 caHty and the season. 

 Many of the insects in 

 the flax-seed stage pass 

 the summer in wheat 

 stubble. These may be 

 destroyed by burning 

 over the stubble fields or 

 plowing deeply and roll- 

 ing. An adequate sys- 

 tem of crop rotation is 

 very helpful in prevent- 

 ing outbreaks, while the 

 selection of varieties 

 having strong stems or 

 the habit of tillering 



freely is helpful in pre- s- Pupa. Magnified. 



venting damage when the pest is present. The adult Hes- 

 sian Fly is shown much magnified in the picture below. 



Hessian Fly 



. Larva. 4. Puparium or "flaxseed.' 

 5. Pupa. 



