AMERICAN PLUM BORER. 
Table II. — Emergence of sprino brood of moths of the plum borer at Winchester, Va., in 
1913. {See fig. 1.) 
Date cf 
observa- 
tion. 
Number 
of moths 
emerg- 
ing. 
Date of 
observa- 
tion. 
Number 
of moths 
emerg- 
ing. 
Apr. 25 
29 
May 3 
7 
11 
15 
1 
6 
10 
34 
6 
3 
May 19 
23 
27 
31 
June 4 
8 
Total.. 
3 
5 
1 
2 
8 

79 
Girault, in 1905, records one adult that emerged at Washington as 
early as April 21 and later notes that empty pupal cases were very 
plentiful in the field by May 2. In normal seasons adults probably 
begin appearing in the latitude of Winchester and Washington from 
the last of April to the first of May. Rosenfeld, in 1906, observed 
emergence in Georgia as early as March 29, or about one month 
earlier than it occurred at Washington the preceding year. In 1913 
maximum emergence occurred at Winchester on May 7, twelve days 
after the first moth appeared, and adults continued to emerge in the 
rearing cages in lessening numbers until June 4. The seasonal 
appearance of the moths can be more easily appreciated by reference 
to figure 1. 
35 
SO 
25 
2G 
I" 
1* 
2/ 
25 23 c 
1 7 
// 
/5 /S 
23 
27 
3/ 
+ e 
1/^/P/l. 
MAT 
JUNE 
Fig. 1.— Diagram showing emergence of spring brood of moths of the American plum borer 
(Etizo-phera semifuneralis) at Winchester, Va., in 1913. (Original.) 
OVIPOSITION OF FIRST GENERATION OF MOTHS. 
As the moths emerged from day to day they were transferred to 
jars containing twigs of plum or apple wood, all of those issuing on 
the same date being confined in one jar and a record kept of the 
number of eggs subsequently deposited. Eggs were laid freely on 
the twigs, singly or in small groups in the cracks and crevices of the 
