26 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
TaBLE I1X.—Feeding periods of second-brood larve in pears, Walnut Creek, Cal., 1909. 
Date of— : Date of— | pa Date of— 
es ___| Perioa'|] M24 Period || di |_ Period 
Mari | of feed-|| ay of feed-|| a1 of feed- 
ual! Hatch- | Leaving | ing. ve Hatch- | Leaving | ing. Hatch- | Leaving | ing. 
No. : : No. p : No. : : 
z 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 14 297 ||" 27. = 26 20 25 || 48 2 26 24 
7a 16 16 31 || 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 2 | Sl=< 29 25 27 |; 52. 3 21 18 
lla 24 | 19 20 |||\"ooee 29 21 23 || 53 3 29 26 
12 24 21 28 || 33... 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 39 || 36 29 23 | 25 || 57 4 25 21 
16 25 18 24 || 37. 29 24 26 || 58. 4 28 24 
lia... 25 20 26 || 38... 29 | Sept. 8 41 || 59... 4 31 27 
18s2: 25 18 24 || 39... 29 | Aug. 12 | 14 || 60... 6 | Sept. 1 26 
1953 25 26 B27 4002: 29 13 Sy Glens 6 | Aug. 29 23 
20525 25 | 21 27 |) Alene |PAnis= 92 | 26 | 24 || 62 6 31 25 
21 25 | 27 33 | 42... 2 | 24 | 22 | 63 6 31 25 
‘ ’ iW 
a Pupated and moth emerged in September. 
Feeding period: Days. 
INN CTAG Ce acc nwind = a yee isjoine es satel ees Heo DRE oe OR ne SST SE 8 SE SEO eee ee Ce eee 26. 34 
Mascimm) = |) acorn be eae ere ee Se ee ne ee ee 41.00 
Mitr. 3s wise ies = csi Sng risus a east ele se Re ieee oceans CaO les oO OOS ae 14.00 
Overuintering 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 larvee 
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 
larve 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 larvee 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 larve, and the fact that the pears are picked 
before very many of the second-brood larve 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 
