-219- 
WHEAT 
HESSIAN FLY ( Phytophaga destructor Say) 
New York C. R. Crosby: Owing to unpreventable conditions, it was necessary 
to restrict the Hessian fly survey this year to eight counties in 
the western part of the State. These indicate that the average 
infestation for this region was 8.5 per cent compared with an in- 
festation in 1922 of 1.2 per cent (see Vol. 2, page 195) and 5.2 
per cent in 1921 (see Vol. 1, page 182). The infestation, by 
counties, is as follows: 
Genesee 
Wyoming 
Monroe 
Livingston - 
5.33 • 
Wayne 
- 
18.35 
1.60 
Ontario 
- 
21.89 
7.74 
Chautauqua 
- 
0.00 
2.40 
Yates 
- 
10.67 
Ohio 
North 
Dakota 
Nebraska 
H. A. Gossard (July 25): The annual wheat survey was carried into 
298 wheat fields, distributed over 32 counties. Hessian fly was 
found to be well under control in all counties except in a few in 
northeastern Ohio, where considerable early seeding was made last 
year. There is a distinct increase in infestation in Ashland, 
Lorain, Summit, Portage, Columbiana, and Wayne Counties. In the 
northwestern counties, where the county agents carried on an educa- 
tional campaign, the infestation has been reduced to a very low 
figure by observing the proper seeding dates. Henry County reduced 
its infestation from 40 per cent in 1922 to 2 per cent in 1923, 
Sandusky County from 52 per cent to 7 per cent, and Putnam County 
from 39 per cent to 5 per cent. Wood County in this northwestern 
section had one field sowed too early, with 94 per cent of the straws 
infested and most of them lodged. Fulton County had one field 
sowed September 7, with 82 per cent of the straws infested, and 
another seeded too early had 46 per cent infestation. The reduction 
over northwestern Ohio, therefore, was due to observing the proper 
seeding dates and not to parasitism or natural factors. The State 
average of Hessian fly infestation is 4.4 per cent, compared with 
10.9 per cent in 1922". 
C. N. Ainslie (July 27): Every field in Golden Valley County ex- 
amined was heavily infested in June just as wheat was jointing, and 
a brood of flies has since attacked the grain again. The limit of 
attack is unknown at present. 
M. K. Swenk (August l) : The Hessian fly is now present in the 
wheat stubble in supernormal numbers. During July the infestation 
was traced in the Platte Valley west to Dawson County, it being 
present, in fact, in Furnas, Gosper, and Dawson Counties in greater 
numbers, on the whole, than in the counties intervening between 
them and the principal area of heavy infestation, which includes 
Cass, Otoe, Nemaha, Richardson, Johnson, and Pawnee Counties. 
