Table 1. —. Shipments of corn. borer Parasites for release during 1919 
Species 1 Parasites 
I shipped 
• 
1 
• 
Date of 
shipment 
• 
1 
• 
• 
Destination ! 
• 
Mortality 
. Number 
j 
;a : . ■ 
• 
• 
s 
Percent 
P. nieridens i 33 
• 
• 
April 27 
t 
4 
Burlington, N, J, : 
e 
do t 
0 
L. arises cens — : ' 60 
i 
• 
• 
June l6 
4 
t 
0 
• 
• 
21 
• 
• 
do J 
0 
• 
C. annulipes- — : 9.000 
i 
t 
• 
9 
• 
t 
t 
Springfield, Mass. : 
0.7 
Do : 12,000 
t 
13 
f 
do ; 
.7 
Do : 13,000 
• 
e 
16 
4 
t 
do : 
.4 
Do : 14,000 
e 
• 
19 
4' 
do ; 
.6 
Do- j 8,000 
r 
21 
t 
North Philadelphia, Pal 
.5 
Do- : 15,000 
4 
• 
26 
: 
do ; 
.9 
Do : 4,500 
1 
• 
; 
4 
4 
29 
• 
• 
Indiana ; 
.5 
• 
M. gifuonsis- — t 1,190 
July <1 
• 
• 
• 
• 
Atlantic, N, J. t 
3.9 
Do : 883 
: 
6 
• 
• 
do : 
1/ 
*-^25.8 
Do- : 225 
e 
• 
14 
: 
do : 
Do J ■ 625 
4 
• 
Aug. l6 
} 
Burlington, N. J. j 
0 
Do : 2,065 
i 
23 
: 
Kingston, N. Y. : 
7.9 
Do : 385 
t 
I. punctoria- — 1 176 
: 
29 
• 
• 
f 
Burlington, N. J, : 
0 
t 
1 
5 
# 
1 
4 
do : 
0 
Do- — : 153 
t 
8 
1 
do s 
0 
Do- : 97 
i 
... 16 ... 
t 
do ! 
0 
• 
Total 81,452 
4 
4 
: 
t 
f 
• 
t 
— — ; 
— •—» 
Average mortality; — 
s 
— 
t 
0.9 
Mostly old parasites accumulated at laboratory* 
The major emphasis in the com borer parasite colonization program for 
1939 was placed on an attempt to establish the egg-larval parasite C he 1 onus annu - 
li pos Wesm. in two districts where the com borer has been particularly abundant 
and has caused considerable damage. These were the Connecticut and the Quinnipaa* 
River Valleys in Connecticut^' and the Hudson River Valley, south of Albany in Ne* 
York State. 
A colonization program was devised* involving releases of this parasite at 
4- and 5~mile intervals throughout the districts chosen. This method of coloniza^ 
tion. a departure from the s ingle-colony type usually employed for releases of 
com borer parasites, was selected after consideration of the habits and reaction* 
of the parasite, both in Europe and the United States* In northern Italy, the 
region from which annulipes was imported, it* distribution is extremely uneven# 
It is abundant in certain localities and absent in others a short distance away. 
In the vicinity of Taunton, Mass#, the area of continuous paras itizat ion has in- 
creased in size and within this restricted area paras itizat ion by C.. annulipes con 
pares favorably with that produced by other parasites of the corn borer. However, 
Connecticut River now flows from south of Hartford i: 
ection to the sound. 
extending from the Massachuso 
to Long Island Sound, The 
a general southeastward dir- 
