70 
THE PLUM CURCULIO. 
A total of 411 larvae was under observation, the time spent in the 
fruit varying from 15 to 30 days. The average of all individuals 
was 21.43 days. 
Observations were also made at Douglas, Mich., during 1910 by 
Mr. Hammar, on the complete life-cycle period of 121 individuals. 
For purposes of comparison the egg and larval stages combined are 
shown in Table XXX. The fruit used was peach. The average 
time for all individuals for June and July was 20.8 days. 
Table XXX. — Length of time spent in fruit by the plum curculio (egg and larval stages 
combined), Douglas, Mich., 1910. 
^ggs 
depos- 
ited. 
Date of 
egg deposi- 
tion. 
Larvae leaving fruit in specified days from deposi- 
tion of eggs. 
Total 
egg and 
larval 
days in 
fruit. 
16 
17 
IS 
19 
1 i 
20 i 21 22 
23 
24 
25 
26 
27 
6 
10 
4 
June 24 
June 29 
June 30 
i i ! i 
3 
3 
2 
1 
3 
2 
2 
i 
1 
Total 
3 
3 
5 
4 
1 1 
3 
392 
38 
20 
19 
16 
6 
1 
1 
1 
July 1 
July 2 
July 3 
July 4 
July 6 
July 20 
July 21 
'otal 
1 
3 
22 
"4" 

...J 5 
6 7 
8 
3 
2 
1 
8 
10 
7 
6 
1 
1 
1 
4 
10 
15 
32 
24 1 19 
11 
2 
1 
1 
2,122 
3 
T 
'otal for 
June and 
July 
36 
! 
25 20 
11 
5 
1 
1 
2,. 514 
Average time in fruit for June days. . 19. 6 
Average time in fruit for July do 21 
Average time in fruit for June and July do 20. 8 
In Table XXXI are shown the results of observations on the length 
of time spent in the fruit by the curculio at Barnesville, Ga., during 
1910. The fruit used was peach. 
