78 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
the sides of the jar. The apples and foliage were daily removed and 
replaced by fresh material, and to avoid infestation from hatching 
eggs, which had been placed on the sides and bottom of the jars, 
it became necessary to transfer the moths twice a week into new 
jars, the old ones being thoroughly cleaned before being put to fur- 
ther use. 
In Table VII have been recorded the results from observations on 
oviposition in 12 rearing jars by moths of a given age. In no 
instance did oviposition take place until 2 days after the emergence 
of the moths, and on an average the eggs were first laid during the 
fourth day after emergence. 
TaBLE VII.—Oviposition periods of spring-brood moths in rearing cages. 
Date of— | Days— 
Between 
. Number 
Cage No. emer- 
ofmoths,| Emer | Pirt ovi] Last ovi-| Before | Length | genes 
moths. | Position. | position. | “ yi¢n. sition. ae 
tion. 
1 7 | June 16 | June 23 | June 25 | 7 3 9 
2 10 | June 17 | June 27 | June 29 10 3 12 
3 10 | June 19 | June 24 | June 24 5 1 5 
4 17 | June 20} June 23 | June 30 3 8 10 
5 11 | June 21} June 24 | June 29 3 6 8 
6 10 | June 22 | June 25] July 1 3 | 7 9 
7 39 | June 23 dost: July 6 2 | 12 | 13 
8 18 | June 24] June 27} July 5 3 9 | 11 
9 37 | June 25 |..-do..... July 7 2 11 12 
10 23 | June 29} July 7] July 15 8 9 16 
11 LSM Polya ea evel vanmon seed One 4 11 14 
12 4} July 7] July 12} July 21 5 | 10 14 
201 | 55 | 90 133 
The length of oviposition for each jar varied from 1 to 11 days, 
with an average of 7 days for the entire number of rearing jars. In 
one instance oviposition took place the sixteenth day after the date 
of emergence of the moths. On an average, however, oviposition 
extended to 11 days after emergence. ! 
TaBLE VIII.—Oviposition periods of spring-brood moths. Summary of Table VII. 
| Days be- 
Days be- Days of |tween emer- 
Observations. fore ovi- oviposi- | gence and 
position. | tion. last ovipo- 
sition. 
IAVOLALCL 2.fen some see ee eee 4.6 7.5 11.08 
Mas mami 2 2 ate arse eae 10 12 16 
Miriam eee | Ze 1 5 
In view of the abundance of eggs deposited and the manner in 
which they were laid, it was impossible to determine the number for a 
given moth. In the field the relative abundance of eggs during the 
season must be approximately in proportion to the occurrence of 
moths (fig. 19). In the rearing jars eggs were obtained from June 23 
