118 
THE PLUM CURCULIO. 
blooming period of apples or shortly after the petals of peaches, pears, 
and plums have fallen. In some seasons, however, the curculios may 
appear as early as the blooming period of the plum or be retarded 
until after apples have shed the petals. Thus it appears that the 
beetles are affected by temperature to a different degree than are the 
plants on which they live. Probably the curculios are more sensi- 
tive to short periods of warmth and less so to longer periods at a 
somewhat lower temperature. 
RELATION OF TEMPERATURE TO APPEARANCE OF BEETLES. 
A comparison of the numbers of beetles caught in jarrings with the 
average daily mean temperature immediately preceding each jarring 
furnishes information on the temperature necessary to bring the 
beetles out of hibernation. Such data are available from Youngs- 
town, N. Y., for 1905; Siloam Springs, Ark., for 1908; and from 
Barnesville, Ga., North East, Pa., and Douglas, Mich., for 1910. 
These are given in Table LXVI. 
Table LXVI. — Jarring records showing relation of temperature to appearance of beetles 
of the plum curculiofrom hibernation. 
Barnesville, 
Ga. 
Siloam Springs, Ark. 
North East, Pa. 
Douglas, Mich. 
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Mar. 10 
63 
19 
Mar. 28 
69 
6 
Apr. 15 
43 
3 
May 7 
44 
2 
May 11 
54 
3 
14 
55 
9 
30 
48 
20 
52 
10 
52 
3 
12 
50 
17 
16 
47 
1 
31 
52 
"2 
22 
39 
13 
46 
2 
15 
57 
36 
18 
50 
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Apr. 2 
61 
.... 
26 
45 
16 
45 
3 
16 
59 
6 
21 
57 
20 
4 
43 
28 
45 
19 
54 
15 
17 
59 
63 
23 
59 
483 
6 
52 
1 
May 2 
50 
24 
60 
115 
19 
56 
21 
25 
67 
840 
8 
64 
42 
4 
53 
26 
52 
58 
22 
50 
18 
28 
69 
1,071 
11 
56 
17 
6 
41 
28 
48 
67 
24 
50 
9 
30 
71 
563 
13 
53 
13 
9 
49 
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June 1 
51 
57 
27 
59 
45 
Apr. 1 
4 
70 
534 
14 
61 
8 
11 
51 
.... 
3 
44 
74 
30 
56 
43 
71 
427 
15 
62 
44 
13 
40 
6 
53 
82 
June 1 
52 
34 
6 
71 
243 
17 
66 
64 
16 
40 
9 
50 
97 
8 
65 
166 
20 
64 
146 
19 
62 
"5" 
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94 
11 
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169 
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169 
21 
60 
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27 
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26 
61 
22 
21 
69 
114 
18 
64 
72 
30 
46 
16 
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1 
24 
75 
103 
20 
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May 2 
51 
41 
30 
60 
19 
27 
72 
47 
22 
54 
53 
5 
64 
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June 2 
46 
4 
30 
68 
145 
25 
59 
15 
9 
54 
28 
4 
50 
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July 4 
74 
105 
27 
46 
16 
12 
62 
57 
6 
50 
6 
29 
55 
90 
14 
67 
15 
8 
51 
4 
May 2 
70 
125 
21 
72 
91 
10 
56 
31 
4 
73 
82 
25 
71 
193 
13 
57 
13 
6 
67 
52 
27 
74 
198 
15 
64 
19 
9 
66 
29 
30 
70 
87 
16 
67 
37 
11 
65 
101 
18 
66 
19 
13 
73 
31 
20 
22 
25 
27 
67 
70 
69 
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