302 
JOURNAL 
OF ECONOMIC 
ENTOMOLOGY 
[V< 
Oct 
4 
43% 
20 
43% 
5 
65% 
21 
22% 
7 
61% 
23 
20% 
11 
7% 
25 
48% 
28 
19% 
29 
16% 
30 
15% 
Oct 2 
12% 
6 
0% 
1921 
Sept 
15 
98% 
Sept 8 
68% 
24 
13% 
13 
79% 
26 
0% 
15 
90% 
16 
65% 
17 
59% 
19 
47% 
20 
13% 
21 
6% 
22 
3% 
23 
0% 
26 
0% 
1922 
Sept 
15 
76% 
Sept 16 
29% 
16 
55% 
20 
11% 
17 
42% 
21 
27% 
19 
19% 
22 
2% 
20 
12% 
23 
2% 
21 
16% 
25 
0% 
22 
0% 
23 
0% 
25 
4% 
26 
3% 
27 
3% 
28 
0% 
Oct 
2 
0% 
The previous narrative of developments throughout each season leads 
up to the question of whether or not our fly-free date variations as shown 
above are of sufficient importance to discredit established safe sowing 
dates for northern counties. We do not believe such to be the case. 
However, it seems likely that established dates in northern Ohio will 
be continually subject to modification which should be determined upon 
by the entomologists. The intensity of hessian fly infestation as 
determined through the annual wheat insect survey will indicate to us 
in what particular section of the state and what particular group of 
counties modifications of established dates should be made. In heavily 
infested counties it is quite likely that the stragglers of a heavy fall 
emergence of adults would be equal to or greater than the crest of a light 
emergence. We have taken care of this by setting the dates two to 
five days later for such counties than the established dates for the entire 
state. With the extension organization now furnished within the coun¬ 
ties, including committees to decide upon such policies, we find no 
difficulty in modifying a previously used seeding date when local con¬ 
ditions are explained to these crops committees. Published daily 
records of hessian fly egg-laying determined at the site of the emergence 
stations help to impress those farmers previously indifferent to the 
scheme of cooperation. 
