Vol, 20 
Supplement to No, 8 
October 15, 19^0 
HESSIAN ELY SURVEY AT HARVEST TIME 1940 
Summarized by W, B. Cartwright 
Division of Cereal and Eorage Insect Investigations 
U, S. Bureau of Entomology and Plant Quarantine 
Eield surveys made by the Bureau of Entomology and Plant Quarantine 
stations at Manhattan, Kans,, Lafayette, Ind, , and Carlisle, Pa,, and by the 
State agricultural experiment stations of Illinois, Ohio, and Missouri indicate 
that hessian fly infestations are low in wheatfields throughout Maryland, 
Delaware, northeastern and southern Virginia, south-central Pennsylvania, 
north-central North Carolina, Ohio, Indiana, Michigan, southern Illinois , 
west-central Tennessee, and northern and southeastern Missouri, There are, 
however, menacing populations of flies in local fields and areas in most of 
these States or districts, 
Hessian fly infestations range from low to moderate in north-central 
Pennsylvania, northwestern Virginia, Kentucky, eastern Tennessee, eastern 
Illinois, and in south-central and eastern Kansas, with local infestations 
trending upward. No surveys wore reported for Iowa., but fragmentary data 
indicate that infestations are from low to heavy in southeastern Nebraska, 
Erom moderate to heavy infestations of the hessian fly occur in eastern and 
western Pennsylvania mad in southwestern Missouri, Observance of the safe- 
seeding dates is advised in all areas, because the season has been favorable 
for hessian fly and for growths of volunteer wheat. 
The data summarized in the following table, and the accompanying 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. 
