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then deposits her eggs in the bag and in a short time emerges a 
second time from the cocoon, dies, and falls to the ground. The 
eggs remain in the bag until time to hatch the following spring. 
Since the eggs are deposited in the bags and remain there 
during the winter, one of the best means of controlling the insect 
is to collect and burn the female bags before time for the young 
caterpillars to emerge in the spring. This is not a difficult 
matter, especially on deciduous trees, since the bags are very 
conspicuous in the winter after the leaves have fallen. When 
we take into consideration the fact that for each female bag 
burned a large number of eggs have been destroyed which would 
otherwise have developed into active caterpillars in the spring, 
Wwe can appreciate the value of this means of control. Hand 
picking in the summer time is also quite effective and practical 
especially on small evergreens and shrubs. Even on large 
trees a great deal can be accomplished along this line by the use 
of a long-handled pruning hook. 
If the hand picking has been neglected or the insects are too 
numerous to be handled by this means, the caterpillar, being a 
leaf-feeder, can be checked by the use of a stomach poison sprayed 
or dusted on in the usual manner. If hand picking has been 
persistently practiced spraying will seldom be necessary for 
this insect. During the present spring a careful search of a 
large number of small evergreens revealed only a half dozen 
bags and all of these were on arbor-vitae. Of course some were 
doubtless overlooked. Hand picking has been claimed to be 
uneffective for evergreens because of the difficulty of locating 
the bags, but in our own grounds it has been found quite effective. 
Like most destructive insects the bagworm has a large number 
of natural enemies, although on account of their protection they 
are not easily taken by birds. Their most effective natural 
enemies consist of other kinds of insects. One objection to the 
burning of the bags which have been gathered is the fact that 
in destroying the bagworm eggs we also destroy a large number 
of parasites, which if allowed to emerge would be decidedly 
beneficial in holding the harmful insect in check. As a safe- 
guard against this the bags can be placed in a barrel or other 
