T12 INJURIOUS INSECTS OF I909 AND IQIO. 
will have to depend upon these parasites, or upon fungous diseases, 
in remote regions where large tracts are involved. They are not 
always troublesome, doubtless owing to the work of the two agen- 
cies just mentioned. If one has a few ornamental larch trees af- 
fected, the worms can easily be shaken off the tree; they will not 
climb up the trunk. Or the trees can be sprayed with arsenate of 
lead, four pounds to 100 gallons of water. This Division will 
probably have occasion to report further upon this timber pest at 
a later date. 
