88 
TV. — Deration of life of the codling moth inside the cocoon — Continued. 
Date of entering band. 
Number 
of 
larvse. 
Date 
moths 
emerged, 
Number 
of moths. 
Time. 
Total 
tempera- 
ture. 
Average 
tempera- 
ture. 
Aug. 6. 
Aug. 13. 
Aug. 15. 
Aug. 20. 
Aug. 22. 
1902. 
Aug. 25 
Aug. 26 
Aug, 27 
Aug. 28 
Aug. 29 
Aug. 30 
Sept. 1 
....do... 
Sept. 8 
do ... 
Sept. 12 
do ... 
Sept. 17 
Days. 
392 
425 
456 
485 
503 
519 
558 
468 
674 
604 
607 
547 
633 
The number of larvae used was 170, and the stage varied from 11 to 
49 days, with a weighted average of 22 days. This average is some- 
what longer than that se9ured by other observers, and may be partly 
accounted for by the lateness of the season. 
The principal point to be clearly shown is the length of the mini- 
mum stage, which these experiments show to be not less than 10 to 12 
days. 
The time spent in the cocooil l)v the hibernating larva^ varies con- 
siderabl}^ but usually lasts about eight months. If the larvae are 
taken inside and kept where the temperature is higher, moths will 
sometimes emeroe in Januarv or Februarv. 
INFLUENCE OF TEMPERATURE UPON THE DURATION OF THE STAGE. 
Various authors have stated at A^arious times that this stage might 
be considerabl}^ lengthened or .shortened by temperature. Table V 
shows a preceding table arranged according to the effective tempera- 
tures and the lengths of time. 
Table Y. — Effective temperature and length of cocoon stage of codling moth. 
Average 
Total 
Average 
Total 
Average 
Total 
tempera- 
tempera- 
Days. 
tempera- 
tempera- 
Days. 
tempera- 
tempera- 
Days. 
ture. 
ture. 
ture. 
ture. 
ture. 
ture. 
°r. 
°F. 
°F. 
°F. 
. °F. 
OF. 
17 
209 
12 
25 
604 
24 
29 
1, 284 
45 
224 
13 
26 
547 
21 
30 
535 
18 
18 
270 
15 
607 
23 
600 
20 
19 
302 
16 1 
674 
26 
31 
494 
16 
330 
17 1 
28 
553 
20 
528 
17 
21 
392 
19 
58 1 
21 
566 
18 
425 
20 1 
641 
23 
566 
18 
433 
20 1 
1,171 
42 
722 
23 
558 
26 1 
1,392 
49 
32 
481 
15 
22 
456 
21 
29 
550 
19 
511 
17 
485 
22 i 
615 
21 
583 
IS 
503 
23 
633 
22 
645 
20 
519 
24 
661 
23 
455 
14 
23 
505 
22 
693 
24 
33 
362 
11 
24 
543 
633 
23 
26 
783 
1,115 
27 
38 
424 
13 
25 
468 
19 
1,170 
41 
1 
