-301- 
t hough not of sufficient intensity to reduce yields serious!;'. The outlook 
for fly injury this fall in Ohio, Indiana, and Illinois is the most threatening 
in years. Practically every stubble field contains enough puparia to be a 
potential source of heavy infestation in any early fall- sown wheat near by. 
While the percentage of parasitized puparia is higher than usual in Ohio and 
Indiana, viable puparia are still very abundant in the stubble. The prospect 
is less threatening in Kentucky-, Tennessee, and southern Michigan but with fall 
weather favorable to its activity the fly is likely to cause material injury 
to the 1933 crop in these States also. The following table summarizes the 
records on which this report is based. Field samples consisted of 50 stems 
and plot samples of 100 stems, the 'average infestation in each set of plots 
being used as a single field. The figures below are entirely our own but the 
report of the Ohio State Hessian fly survey has been referred to in summarizing 
the situation in that State. 
Area 
S. W. Michigan 
Number of localities Number of fields 
11 
19 
Per cent of stems in- 
fested 
19 
N. E. Illinois 
12 
12 
14 
3. and -S. .. liter 
ois 
35 
46 
44 
Indiana 
95 
198 
41 
Ohio 
49 
67 
32 ' 
Kentucky 
35 
51 
8 
Tennessee 
49 
98 
12 
West Central States. J. P. Horton (August): This report is based on a survey 
during June and July covering Kansas, Missouri, Nebraska, and Oklahoma, 
exclusive of areas beyond the present range of serious Hessian fly outbreaks* 
Severe damage, resulting in partial to complete loss of the 1932 winter wheat 
crop of many fields, was done by the fly in Missouri, southeastern Nebraska, 
and some counties of north central and northeastern Kansas during the season 
1931- '32. Infestations were comparatively slight and crop reductions relative- 
ly unimportant in southern Kansas and northern Oklahoma. The prospects of 
fly injury to the winter-wheat plantings of the coming fall are unusually 
threatening in Kansas, Missouri, and Nebraska, except in the frontier areas 
of occurrence already mentioned. Most of the Missouri counties inspected 
and most of the normally fly- populated counties of Nebraska are strewn with 
heavily infested stubble fields. The same is true of some of the counties 
sampled in northeastern and central Kansas; while even those of the south- 
eastern portion of this State have a scattering of sufficiently infested 
fields potentially to give rise to outbreaks in neighboring fall-sown wheat. 
Although the percentage of parasitized puparia is -reater than usual over 
most of these areas, there are still sufficient numbers of living Hessian 
fly larvae present to: 'favor ready emergence and plentiful egg deposition in 
the fall. The outlook is not serious in the northwestern portion of Kansas, 
■ where the fly rarely becomes abundant, but even in that section there is a 
very noticeable increase of puparia and sufficient population now present for 
potential local outbreaks following weather favorable to fly increase. The 
prospects for northern Oklahoma are good in that the summer infestations are 
slight, except locally in the extreme northeastern portion. The attached 
table summarizes the results from tfrhich this report is drawn and includes 
records from a total of .930 samples, 565 of which were our own; 270 were 
supplied by the Nebraska experiment station, 76 by the Missouri station, and 
the remainder by the Kansas station. A large proportion -of the samples were 
