8 
tertiary parasite.  Habrocytus thyridopterigis Ashm. (fig. 11) is 
assumed to be a tertiary parasite on <AJllocota thyridopterigis Raley, 
when the latter is a secondary parasite of the tussock moth, but may 
be secondary when breeding in the cases of the bagworm. 
REMEDIES. 
When the bagworm occurs upon deciduous trees it can be controlled 
by hand-picking the bags in the winter, but when it affects evergreen 
trees it is practi- 
cally impossible to 
apply this remedy 
with profit unless 
the plants are badly 
defoliated. There- 
fore for the treat- 
ment of evergreens 
spraying is a neces- 
sity. 
The methods of 
controlling shade- 
tree pests in cities 
and towns, as out- 
lined in Farmers’ 
Bulletin No. 99,7 on pages 25-29, are in part applicable to this species. 
This bulletin should be read by persons who have experienced trouble 
from the depredations of the bagworm. 
Collecting the bags. — 2 
One of the most important 
remedies consists in gath- 
ering the bags with the 
contained insect by hand 
and either burning them 
or preserving them to lib- 
erate the useful parasites 
which have been previ- 
ously mentioned. This 
work may be facilitated 
by the use of a 12-foot 
pole pruner or similar 
appliance, and can be intrusted to those ordinarily unemployed, such 
as children and aged persons. Where the trees are very tall it will 
be necessary to use a long ladder. For best results the cooperation of 
neighbors who are troubled with the same pest should be secured. 
Fic. 10.—Dibrachys boucheanus: Adultfemale and antenna of male. 
Much enlarged (from Howard). 
Fie. 11.—Habrocytus thyridopterigis. Greatly enlarged (from 
Howard). 
aThis publication may be had gratis on application to the Department of Agriculture. 
(Cir. 97] 
