1924] 
Winter Mortality of the Europeaii Corn Borer 
289 
No. 7. 
December 1, 1Q22 to March 31, 1923. 
No. days 
mini- 
mum 
below 0 ° 
Total 
amount 
temp. 
below 
32° 
Total 
amount 
temp, 
below 0° 
Greatest 
range in 
a 24 hr. 
period 
Average 
daily 
range 
Detail of 
greatest 
range in 
a 24 hr. 
period 
Winter 
mortal- 
ity 
averaged 
in groups 
Number 
of 
localities 
9 
2204 
33 
38 
15.3 
36 to -2 
29 
2826 
236 
39 
19. 
44 to 5 
33.5% 
3 
34 
2980 
300 
51 
23.2 
33 to -18 
19 
2399 
106 
45 
18.5 
35 to -10 
13 
2269 
66 
44 
18.9 
35 to -9 
9 
2084 
68 
48 
19.3 
36 to -12 
25 
2404 
201 
46 
22.6 
36 to -10 
22.6% 
2 
23 
2366 
141 
49 
20.4 
37 to -12 
1 
13,59 
4 
33 
14.8 
41 to 8 
12 
1999 
39 
42 
18 
36 to -6 
4 
1718 
7 
31 
135 2 
35 to 4 
3.9% 
4 
0 
1347 
0 
37 
14.7 
42 to 5 
0 
1410 
0 
37 
15.5 
42 to 5 
2 
1701 
3 
36 
17.5 
54 to 18 
.88% 
5 
0 
987 
0 
24 
11.9 
36 to 12 
No. 8. 
December 1, 1923 to March 31. 1924. 
No. Gays 
mini- 
mum 
below 0 ° 
Total 
amount 
of temp, 
below 
32° 
Total 
amount 
of temo. 
below 
0° 
Greatest 
range in 
a 24 hr. 
period 
Average 
daily 
range 
Detail of 
greatest 
range in 
a 24 hr. 
period 
Winter 
morta- 
lity 
a\ eraged 
by 
groups 
N umber 
of 
localities 
5 
1430 
55 
48 
14.5 
.-6 to -12 
11 
2052 
83 
38 
16.1 
38 to 0 
22 
2296 
175 
53 
21.2 
39 to -14 
9. % 
12 
9 
1677 
65 
40 
17.3 
45 to 5 
3 
1624 
39 
17.6 
43 to 4 
6 
1407 
27 
41 
18 
40 to -1 
10 
1711 
49 
38 
21.6 
38 to 0 
8 
1558 
35 
37 
19.1 
41 to 4 
1 
940 
10 
35 
15.3 
45 to 10 
4 
1409 
3i2 
39 
17.7 
59 to 20 
2.6% 
29 
4 
1241 
17 
34 
14.2 
28 to -6 
55 to 21 
2 
806 
9 
37 
13.8 
37 to 0 
1 
892 
2 
25 
14.4 
25 to 0 
33 to 8 
37 to 12 
2 
1126 
4 
32 
16.8 
42 to 10 
1-3% 
6 
0 
710 
0 
33 
13. 
45 to 12 
