WHEAT BTILB FLY; HESSIAN FLY. 



61 



sheathing, and be only moderately injured by the maggot workings. 

 In these conditions the attack is recognizable by the lower part of the 

 ear being injured, and by the blackened furrow which has been gnawed 

 by the maggot down one side of the stalk, from the ear to the first 

 joint. This attack is one of our common and serious Barley 

 infestations. 



Of "Wheat-bulb maggot," of Hylemyia coarctata, a small two- 

 winged fly, an infestation which has been doing a very serious amount 

 of mischief for some years back, very little also was reported. This 

 infestation is hurtful by the maggots feeding in the heart of the young 

 Wheat (in the same manner as the maggot of the Frit Fly in young 

 Oats, see pp. 51 to 57), the attacks being hardly distinguishable with- 

 out the help of a good magnifier. This attack of the Wheat-bulb 

 maggot especially occurs on land which has either been fallowed in 

 the previous summer, or where the laud has been cleared of crop, or 

 the crop so thin as to expose the land. 



Of "Hessian Fly," Cecidomyia destructor, very little indeed was 

 said, and nothing of any importance. This attack is distinguishable 

 by the infested Corn stalk, commonly Barley, but sometimes Wheat, 



EO 



1, Barley stem elbowed down by Hessian Fly attack; 2, showing position of 

 "flax-seeds." Also tlax-seeds, or puparia, nat. size and magnified, showing the 

 early and smooth, and the later, or striated, condition. 



being what is called "elbowed " down. The white legless maggot, or 

 maggots, of the Hessian Fly feed by sucking the juices from the stem 



