10 BULLETIN 1103, U. S. DEPARTMENT OF AGPJCULTUEE. 



In Indiana a large spring brood was reported early in April, 99 

 per cent of the stalks being infested in places in the southern part 

 of the State. During June much fallen wheat was observed. In 

 Illinois the infestation was slight except in a few of the west-central 

 counties along the Mississippi River. Iowa reported that the Hes- 

 sian fly was on the increase in the southeastern and south-central 

 counties, the winter wheat examined on December 22 being very badly 

 infested. 



Minnesota reported practically no flies, while Wisconsin reported 

 no serious infestation, ' but flies present over the southern tier of 

 counties. 



According to W. H. Larrimer, Bureau of Entomology, the general 

 infestation throughout the Central States, although showing some ir- 

 regularities, has declined greatly, due no doubt to the response of 

 wheat growers to the efforts of extension and other entomologists of 

 Ohio, Indiana, Illinois, and Missouri in cooperation with the Federal 

 Bureau of Entomology. The recommended safe- sowing dates held 

 remarkably well in the fall of 1921 and there seems to be no doubt 

 that if wheat growers had not adopted the recommendations a heavy 

 infestation would have occurred in practically all early sown wheat. 

 There was no indication of a late wave of the Hessian fly such as ex- 

 isted during the fall of 1920. A slight supplemental brood, originat- 

 ing in volunteer wheat, was present in local areas from La Fayette, 

 Ind., southward, but in general the status of the fly during the fall of 

 '1921 was considerably less menacing than was the case early in the 

 spring. Practically all wheat sown^f ore these dates began the win- 

 ter in splendid condition, and practically no Hessian fly infestation 

 occurred in this grain. A slight menace to this grain exists in some 

 regions in the volunteer wheat. Parasitism is rapidly increasing. 



In the area west of the Mississippi River, according to J. R. Hor- 

 ton. Bureau of Entomology, no serious infestations occur at the pres- 

 ent time, except in northeastern Oklahoma, where local heavy infes- 

 tations aire indicated. Conditions in Kansas are especially promising 

 so far as the Hessian fly is concerned. The heaviest infestation in 

 the fall examinations was in Sedgwick County, which showed an in- 

 festation of between 3 and 4 per cent. The prospects for a crop, how- 

 ever, are not as favorable as might be expected, owing to adverse 

 meteorological conditions. 



Missouri reported early in the season the worst outbreaks since 

 1916, Doctor Haseman stating that counts made in July in 29 

 counties averaged 21 per cent of the straws infested, the heaviest 

 infestation being in the 14 central counties, where the infestation 

 ran as high as 36 per cent, while the infestation in the western 

 counties dropped to 11 per cent. The winter wheat was not sown 



