8 FARMERS’ BULLETIN 101. 
remedy with profit unless the plants are badly defoliated. Therefore, 
for the treatment of evergreens, spraying is a necessity. 
The methods of controlling shade-tree pests in cities and towns? 
are in part applicable to this species. 
COLLECTING THE BAGS. 
One of the most important remedies consists in gathering the 
bags with the contained insects by hand and either burning them or 
preserving them to liberate the useful parasites which have been 
previously mentioned. This work may be facilitated by the use of 
a 12-foot pole pruner or similar appliance. 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. Con- 
siderable immunity from future 
injury will result by care in the 
employment of this method. It 
is particularly useful where only 
a few trees are infested. The 
bags are such conspicuous ob- 
Fic 9.—Spilochalcis mariae. About four times jects on defoliated or bare trees 
Spa reed \ Steg ellen) in winter that it is not at all dif- 
ficult to detect them, but in cases where comparatively few insects are 
present on evergreen trees they are not so easily seen. 
ENCOURAGING THE PARASITES. 
When many trees are infested it is advisable to keep the hand- 
picked bags for a considerable time in receptacles, such as barrels 
covered with netting, preferably wire netting, so that the numerous 
beneficial parasites of the pest will be able to issue in the spring and 
assist in the control of the bagworm the following year. One or two 
holes bored in the bottom of the barrel or box will prevent water from 
accumulating and drowning the insects. Where the bags can be 
‘placed in piles in an open space or inclosure distant from trees and 
free from disturbance, the young insects, having very limited powers 
of locomotion, will soon perish of starvation, as they will not be able 
to find the trees or shrubs after they hatch. 
SPRAYING WITH ARSENICALS. 
On evergreens, where the bags are more or less difficult to find, 
Bul. No. 99, 32 p., 11 fig., 1899. This publication may be had free on application to the 
Department of Agriculture. 
