118 THE PLUM CURCULIO. 
blooming period of apples or shortly after the petais 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. 
TaBLeE LXVI.—Jarring records showing relation of temperature to appearance of beetles 
of the plum curculio from hibernation. 
Barnesville, Ga. Siloam Springs, Ark.| North East, Pa. Douglas, Mich. | Youngstown, lV. Y. 
AQ Ae ae =) ag 
35 a5 35 38 Be 
ga ga a 82 5a 
Lane) 3s aca hes [Bea I as Pein! | os 2a : 
Bea) = Bea) s Beal s Beas BEu) Ss 
Dates. ([28| # | Dates. [SEE] F | Daies. PES] P| Dates. [SES] } | Dates. (SEs) & 
SEE =| SSh/ 3 ofe a SSet| 3 OSE] 38 
oodg| © oo 8| © oos| 2 oom] 2 oH oO 
was} ea-| 2 Lees] 1 o—| a wes] n 
Ses 2 S gis| Say! & Se] & Sxy| & 
n ~— n - ni. . Lilw~ nin 
hes 225) 3 $28) 9 FSS] 3 P25) 2 
< ea) < ea < ea) < ea} 4 ea} 
1910. | °F 1908. Sei 1910. °F. 1910. | “FF 1905. | °F 
Mar. 10 63 9 | Mar. 28 69 | 6} Apr. 15 43 | 3 | May 7 44) 2] Mayll 54 3 
14 55 9 30 ASN ee 20 52 10 52] 3 12 50 | 17 
16 47 1 31 o2 | 2 22 39 13 46] 2 15 57 | 36 
18 50 5| Apr. 2 61 26 45 16 45] 3 16 59 6 
21 57 2 4 43 1 28 45 |_... 19 54 | 15 17 59 | 63 
23 59 | 483 6 52 1| May 2 DOU ee 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 7 | June 1 51 | 57 27 59 | 45 
Apr. 1 7 534 14 61 8 11 51 3 44 | 74 30 56 | 43 
4 71 | 427 15 62 | 44 13 40} 1 6 53 | 82 | June 1 52 | 34 
6 71 | 243 17 66 | 64 16 40 9 50 | 97 
8 65 166 20 64 1146 19 62 5 12 59 | 94 
ll 62] 169 2 66 |169 21 60 | 19 15 63 |315 
13 68 95 24 65 } 75 23 66 | 22 18 70 |350 
15 64 69 27 60 | 10 26 61 | 22 21 69 114 
18 64 72 30 46 | 16 28 50] 1 24 75 |103 
20 56 12 | May 2 51 | 41 30 60 | 19 27 72 | 47 
22 54 53 5 64]13]June 2 46] 4 30 68 }145 
25 59 15 9 54 | 28 4 50 | 13 | 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 
ll 65} 101 18 66 | 19 
13 73 31 20 67 | 28 
22 70 | 26 
25 69 | 21 
27 67 | 19 
29 68 | 18 
