INSECT INJURIES TO FOREST PRODUCTS. 9 
precautions are not taken, and there is evidence that insects are at 
work in the bark and wood, the damage can be checked by injecting 
bisulphid of carbon through natural or artificial openings in the 
affected bark, and immediately stopping these and other openings 
with putty or a similar substance. 
Poles, posts, piles, ties, mine props, and similar products.—Insect 
damage to poles, posts, and similar products can be prevented to a 
greater or less extent by the preservative treatments which have been 
tested and recommended by the Forest Service for the prevention of 
decay. These should be applied before the material is utilized for 
the purposes intended, or, if it be attacked after it has been utilized, 
further damage can be checked to a certain extent by the use of the 
same substances. | 
It is often of prime importance to prevent injury from wood- 
boring insects, for the reason that such injuries contribute to more 
rapid decay. Therefore anything that will prevent insect injury, 
either before or after the utilization of such products, will contribute 
to the prevention of premature deterioration and decay. 
Approved : 
James WIzson, 
Secretary of Agriculture. 
Wasuineron, D. C., October 7, 1910. 
[Cir. 128] 
O 
