HESSIAN FLY 



259 



temperature and moisture. They come out in the fall and 

 are ready to deposit eggs on wheat plants accessible in the 



Fig. 205. — The Hessian fly: pupa taken from "flax.seed," greatly 



eularjicd. (After Marlatt, Div. Eiit , U. S. Dept. A-.) 



Fig. 206.— Injured plants and flaxseeds. (Photo by Ohio Exp. Sta.) 



