INSECT PEST SURVEY BULLETIN 
Vol. 18 Supplement t'o Number 7 September 20, 1938 
Hessian Ely Survey at Harvest- time, 1938 
Eield surveys made "by. the Bureau of Entomology and Plant Quarantine 
field stations at Manhattan and Wichita, Kans., Lafayette, Ind. , and Carlisle, 
Pa., and the State agricultural experiment stations of Illinois, Ohio, Oklahoma, 
and Nebraska indicate that hesaian fly populations are from low to moderate in 
Nebraska, Kansas, Oklahoma, Missouri, and Illinois, the southern half of Indiana, 
central Ohio, Kentucky, Tennessee, western and south-central Pennsylvania, Mary- 
land, Delaware, and Virginia. However, there are menacing populations of flies 
in local fields and areas in most of these States or districts. 
Marked increase of the hessian fly has occurred throughout the northern 
half of Indiana and the northwestern counties of Ohio. Adherence to the safe 
seeding dates is particularly advisable for these districts. 
Slight-to-moderate increases of fly infestations are recorded for central 
Ohio, eastern and northern Pennsylvania, northwestern and south-central Virginia 
and north-central North Carolina, with moderate-to-severe infestations likely 
to occur in the fall of 1938 in Pennsylvania and North Carolina. 
The summarized da.ta below and the accorapanving map indicate more fully 
the regions covered by the survey and the general trend of fly infestations, A 
field sample in the survey usually consisted of 50 wheat stems. 
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