Feb. 25, 1918 Relation of Grain to Hessian-Fly Injury 527 



At Winfield, Kans., the Illini Chief was sown in the center of a 40- 

 acre field of hard wheat. Determinations in the spring showed that 95 

 per cent of the plants of hard wheat were infested, as compared with 

 about 10 per cent for the Illini Chief. 



In 1 91 6, a plot of Illini Chief wheat grown by the side of Turkey 

 wheat showed an infestation of from 3 to 5 per cent, as compared with 

 95 to 100 per cent for the Turkey variety. 



While these tests appear to show that Illini Chief is somewhat resist- 

 ant to the Hessian fly, it should not be assumed that it is the best 

 variety to grow. In Kansas it is one of the least hardy of all winter- 

 wheat varieties and will survive none but the mildest winters. 



CONCLUSIONS 



The Hessian fly is able to discriminate between different kinds and 

 varieties of grain. Eggs were laid on all the kinds and varieties of 

 grain studied, but very sparingly on winter oats, winter barley, einkorn, 

 spring emmer, spelt, and durum spring wheat. 



On the average, fewer eggs were laid on soft winter wheat than on 

 hard red winter wheat, but exceptions in both cases were found. 



There appeared to be a large mortality of eggs or larvae on all kinds 

 and varieties studied. This appeared to be greatest for rye, einkorn, 

 spring emmer, winter oats, and Illini Chief wheat. Very few flaxseeds 

 were found on winter barley, and on Beechwood Hybrid, Currell Selec- 

 tion, and Dawson Golden Chaff wheats. 

 27811°— 18 5 



