INSECT PEST SURVEY BULLETIN 
Vol.2 
September 1,1922 
No.6 
CEEEAL AND FORAGE-CHOP INSECTS 
WHEAT 
. . HESSIAN FLY ( Phvtonhaqa destructor Say) 
New York C.R.Crosby (preliminary survey for 1922). "Survey *aa carried on 
in 14 co-unties in the western part of the State, The average 
infestation in the 14 counties was 1.2 per cent as compafced with 
an infestation at this time last year of 5,2 per cent. The county 
infestations were as follows: 
Ohio 
Indiana 
Illinois 
Iowa 
Per cent 
Per cent 
Per cent 
"Niagara 4.4 
Monroe - - - 0.0 
Cayuga - - -0.0 
Erie 6.5 
Livingston - .0 
Onondaga - - .0 
Orleans ■ .5 
^ayne 3.3 
Oswego - - - .0 
Genesee - - - .8 
Ontario - - - .5 
Tompkins .8" 
Wyoming - - - .4 
Seneca .0 
T.H.Parke (August l). "The Hessian fly is well under control in 
all except the northern counties. The southern half of the State 
has an average of only 3 per cent of the straws- infested. Early 
sown fields, wherever they were present, retained most of their 
flies. The average percentage of straws infested in 15 early 
sown fields in 10 northwestern Ohio counties was 86 per cent. 
The average percentage of straws infested in 72 fields sown after 
the. fly- free date in the same counties was 18 per cent.* 
J.J.Davis (August IS). "Although there is comparatively small 
infestation of the Hessian fly and regardless of the fact that a 
large percentage of the flaxseeds are parasitized, we will continue 
to strongly urge the sowing of the wheat after the fly-free date. 
We feel that this step is essential for satisfactory and continual 
control." 
W.P.Flint (August 17). "There is a general moderate to heavy 
infestation in wheat stubble in the northern part of the State* 
with much lighter infestation in central and southern Illinois. 
Percentage of parasitism apparently very high, averaging from 60 
to 75 per cent with occasional fields running practically 100 
per. cent." 
F.A.Fenton (August 18). T The Hessian fly is very abundant and 
all signs point to a very large fall emergence and subsequent 
wheat infestation. Parasitism of this species, which for the past 
few years has been negligible, is on the increase." 
