60 
THE PLUM CURCULIO. 
39.04 per cent; and small, 15.69 per cent. Adults were never reared 
from the small larvae, though the attempt was repeatedly made. 
At Barnesville, Ga., during 1910, observations were also made on 
this point. Among the first larvae of the season to leave drop fruit 
was a large number of undersized individuals. Many were not more 
than one-half normal length, and from this they varied to full size. 
The proportion of small larvae was greatest during the first week or 
ten days after larvae began leaving the fruit, the proportion becoming 
less and less until by two weeks after the first larvae began emerging 
practically all individuals were of normal size. In Table XXI is 
shown the proportion of undersized larvae during the period from 
May 2 to 21, when they were in evidence. 
Table XXI. — Record of undersized and normal larvse of the plum curculio from drop 
fruit from 31 peach trees, Barnesville, Ga., 1910. 
Dates. 
May 2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
Larvae 
Distinctly 
leaving 
undersized 
fruit. 
larvse. 
Number. 
Per cent. 
49 
38 
78 
68 
33 
48 
119 
48 
40 
1G4 
66 
40 
175 
26 
15 
99 
26 
26 
110 
12 
11 
357 
80 
22 
240 
29 
12 
209 
28 
23 
May 12 
13 
14 
15 
lti 
17 
18 
19 
20 
21 
Larvae 
leaving 
fruit. 
272 
159 
S6 
58 
48 
38 
33 
71 
102 
54 
Distinctly 
undersized 
larvae. 
Number. 
22 
6 
5 
2 
1 
1 


1 
1 
Per cent. 
NORMAL EMERGENCE OF LARV.E FROM FRUIT DURING THE SEASON. 
In order to determine over what period and in what abundance 
larvae left the fruit and entered the soil for pupation, as bearing on 
the period for cultivation for the destruction of the pupae, it was 
planned in 1908 regularly to collect, at frequent intervals through- 
out the season, all of that fruit which fell to the ground and to rear 
and record the larvae as they emerged from the respective lots of 
fruit. This work was done during 1908 at Siloam Springs, Ark., 
using all drop fruit for the season from 120 peach trees; and during 
the same year at Washington, D. C, by Mr. P. R. Jones, with both 
peaches and Japan plums, using all of the drop fruit on 10 peach 
trees, and in addition to the drop fruit from 8 Japan plum trees 
that from the trees at ripening time was also used. 
During 1910 similar data were obtained at Barnesville, Ga., and 
by Mr. Hammar at Douglas, Mich. In Georgia all of the drop fruit 
throughout the season from 31 peach trees was regularly collected 
and larvae recorded as they came from the respective lots. At 
picking time the fruit from 12 of the 31 trees was gathered and 
