16 
A summary of the more important records is here given : 
Records of capture of codling-moth larvse under bands. 
Year. 
Locality. 
Observer or , 
source of rec- 
ord. 
Num- 
ber of 
trees. 
First 
maxi- 
mum. 
Second 
maxi- 
mum. 
Days 
be- 
tween 
maxi- 
ma. 
Total 
num- 
ber of 
worms. 
Time be- 
tween re- 
moval of 
bands. 
Aver- 
age, 
per 
tree. 
1897 
Mr. Ayers 
do.. 
Prof. J. M. Aid- 
rich. 
H. G. Gibson . . 
J. Shearer 
do 
140 
140 
40 
4 
3 
80 
128 
23 
26 
34 
27 
4 
10 
July 17 
July 10 
July 20 
July 26 
July 18 
July 1 
July 5 
....do... 
July 13 
July 5 
July 12 
....do... 
June 25 
Sept. 1 
Sept. 10 
Sept. 24 
Aug. 11 
Aug. 17 
Aug. 30 
....do... 
Sept. 2 
Aug. 27 
Sept. 2 
Sept. 4 
Sept. 10 
Aug. 13 
46 
62 
66 
46 
' 60 
61 
56 
59 
45 
50 
54 
60 
49 
12, 247 
20, 909 
8, 620 
467 
215 
3,554 
1,690 
4,141 
2, 829 
2,880 
194 
666 
640 
Weekly. . . 
do.... 
do.... 
Daily ..... 
Weeklv... 
do.... 
do.... 
do.... 
do.... 
do.... 
do.... 
6 per mo.. 
2-5 days .. 
87.48 
1898 
1899 
1901 
1901 
1901 
do 
Juliaetta 
Nampa 
Payette 
149.35 
215. 50 
116.75 
71.66 
44.42 
1901 
1901 
1901 
1901 
do 
Provo, Utah.. 
do 
do 
do 
Utah Agricul- 
tural College. 
do 
do 
13.2 
180 
108.2 
84.7 
1901 
1901 
1901 
Hagerman ... 
Lewiston 
Caldwell 
R. E. Conner . . 
S. G. Iasman . . 
Win. C.George. 
8.2 
166.6 
64 
659 
55 
All of the records here given show plainly that there are but two 
maxima of larvse entering bands. There are many sources of error 
in obtaining the figures. A maximum lasts from six to eight da} T s. 
Weekly records are much more liable to error on account of the length 
of the intervals. The average length of time between maxima, fifty- 
five days, is undoubtedly too high, as the records of Mr. Gibson 
and Mr. George show the time to be fort} T -six and forty-nine days, 
respectively. 
The writer has secured many other records, but they can not be 
relied upon for determining the number of generations, as some of 
them were taken on too few trees, and others commenced too late or 
stopped too early in the season. 
The intervals between the maxima ma} T be approximated in another 
way. From one maximum of larvae entering bands to another should 
be the length of the life cycle of the insect. The length of the stages 
in the life of this insect vary greatly, and averages can be accurately 
determined only b} r a great number of experiments. The observa- 
tions of the writer upon the length of the different stages are not 
so complete as could be wished, but w 7 ill serve to show the averages 
approximately. The egg stage was found to vary from three to eight 
days, with an average of about five days. The life of the larva outside 
of the cocoon is from fourteen da}^s to twenty-five days, averaging 
about twenty-one days. The time spent in the cocoon was found to be 
from twelve to twent} r -eight days, averaging about twenty-two da} T s. 
The egg-laying period was observed to begin the second day after the 
emergence of the moth and continue till the fourth day. Three da} r s 
would probably be a good average. The total of these averages is 
fifty-one da}^s, which time compares favorably with the interval 
between the maxima of larvse entering 1 bands. 
