INSECTS IXJUllIOUS TO AVHKAT. 107 



injured, while that planted during the middle of Se2)tem- 

 ber is largely or wholly destroyed. 



Fig. 63 shows the proper dates for j^l^nting in Ohio as 

 given by Prof. Webster. Various State experiment stations 

 have issued bulletins giving the proper time to plant in 

 those States, and should the rule given by Dr. Ilojikins 

 prove to be applicable throughout the country, the problem 

 of when to plant will be easily solved.* 



Inasmuch as most of the sj^ring brood remain in the 

 stubble in the flaxseed stage after harvest, if the fields be 

 then burned over, large numbers will be destroyed, but 

 often this is impossible owing to the j^i'ictice of seeding 

 wheat land to grass and clover, which is quite a common 

 practice in many sections. By tlie destruction of all 

 volunteer wheat the two supplementary broods may be 

 reduced, and in the extreme North, where this is the 

 principal means of carrying the insect over winter and 

 spring wheat is grown, this will be found of considerable 

 importance. 



By planting a few strips of wheat late in August or in 

 the first weel: of September many of the flies will be 

 decoyed into laying their eggs upon them, and by then 

 plowing under these strips the eggs and larvae may be 

 destroyed and the regular sowing thus 2)rotected. The 

 trap strips should not be allowed to stand over about 



* See W. Va. Agr. Exp. Station, Bulletin Xo. 67 : The Hessian 

 FlyinW. Va., A. D. Hopkins. Ohio Agr. Exp. Sta., Bulletins 

 Nos. 107, 119 : F. M. Webster. Md. Agr. Exp. Sta., Bulletin Xo. 

 58: W. a. Johnson. U. S. Dept. Agr., Div. Ent., n. s. : The 

 Hessian Fly in the United States, Herbert Osborn. Cornell 

 University Agr. Exp. Sta., Bulletin 194: The Hessian Fly, I. P. 

 Roberts, M. V. Slingerland, and J. L. Stone. 



