26 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
TABLE 1X.— Feeding periods of second-brood larve in pears, Walnut Creek, Cal., 1909. 
Date of— | F Date of— , Date of— 
Indi- __| Period Indi-| Period || di- Period 
vid- vid- vid- 
al | ; of feed- “Fil ; of feed- ive of feed- 
No,| Hatch- | Leaving | ing. No. | Hatch- | Leaving | ing. No, | Hatch- | Leaving | ing. 
5 ing. the fruit. ; ing. the fruit. ¥ ing. the fruit. 
| Days. Days. Days. 
1...| July 12} Aug. 18 37 || 22...) July 25 | Aug. 26 32 || 43...) Aug. 2] Aug. 20 18 
2a... 12 14 33 || 23a. . 26 20 25 || 44... 2 20 18 
3 12 19 38 || 24.. 26 | 20 25 || 45. . 2 22 20 
4a 16 13 28 || 25.. 26 | 23 28 || 46. - 2 27 25 
5a 16 21 36 || 26... 26 22 27 || 47... 2 29 27 
6a 16 14 29 || 27.- 26 20 25. || 48... 2 26 24 
7a 16 16 3l || 28. . 26 21 26 || 49.. 2 26 24 
8a 16 21 36 || 29... 28 18 21 | 50. - 2 29 27 
9a 24 19 26 || 30.. 28 21 24 || 51. 3 27 24 
10. 24 | 20 PALM eke 29 25 Piao 3 21 18 
lla 24 19 26 || 32... 29 21 23 || o3.. 3 29 26 
12 24 21 2Ralltaaee 29 28 30 || 54... 3 31 28 
13 24 27 34 || 34.. 29 22 24 || 55.. 3 26 23 
14 24 21 28 || 35.. 29 19 21 || 56.. 3 27 24 
15 24 | 28 30 || 36.. 29 23 ZOAl poder 4 25 21 
16 25 | 18 24 || 37... 29 24 26 || 58. - 4 28 24 
17a 25 | 20 26 || 38. - 29 | Sept. 8 41 | 50. - 4 31 27 
18 25 18 24 |! 39.- 29 | Aug. 12 14 || 60.. 6 | Sept. 1 26 
19 25 | 26 32 || 40.. 29 | 13 15. |) 61-2 6 | Aug. 29 23 
20 25 21 27 || 41. Aug. 2 26 24 || 62 6 31 25 
21 25 27 33 | 42 2 24 22 | 63... 6 31 25 
I | 
a Pupated and moth emerged in September 
Feeding period: Days. 
Average ... 26 
Maximum. : 
Wibietveshpuseep ee Boer Soe oe RRS ees ae See eee ove Siajera ad Misie Srcce TS tee SEG ee oe 
Overwintering larve.—The first larve not pupating but going into 
winter cocoons in 1909 were taken from bands July 17. Of 78 larvee 
taken on this date, 38 pupated and adults emerged, 28 died, and 20 
went through the winter as larve. Of 196 larve and pupe collected 
under bands on June 28, 1910, 5 did not pupate but wintered as larvee 
in cocoons. After this date the percentage of overwintering larve 
increased. However, some adults emerged as late as September 18. 
With the development of the second brood there was a marked 
increase in the number of overwintering larve. Of some 95 to 100 
larvee developing in fruit out-of-doors at the laboratory, only 9 
pupated. These were Nos. 2, 4, 6, 7, 8, 9, 11, 17, and 23 in Table IX. 
Adults emerged 17 to 36 days after leaving fruit. This would give 
some 6 to 7 weeks for the life of the individuals of the second genera- 
tion. 
REVIEW OF LIFE HISTORY FOR THE YEARS 1909 AND 1910. 
There are practically two full broods of larve each year in the inte- 
rior counties of California. It is not easy to distinguish definitely | 
between the two generations by field observations alone, and to know 
just when all the first-brood larve are in the fruit, although there is 
a period of some weeks each summer during which very few eggs are 
laid. Taking into consideration the difference in time required for 
development of eggs and larvee, and the fact that the pears are picked 
before very many of the second-brood larvee leave the fruit, it is diffi- 
cult to determine the division of generations by band records. Some 
growers report that young larve are hatching and entering fruit 
