6 INSECT INJURIES TO FOREST PRODUCTS. 
to prevent loss. It is important, also, that heavy lumber should, 
as far as possible, be cut only in the winter and piled so that it will 
be well dried out before the middle of March. 
The damage to lumber and square timber when the bark is left on 
the edges or sides can be prevented by removing the bark before or 
immediately after the lumber is sawed, or by sawing and piling the 
material during the winter, or if sawed at other times it should be 
piled so that rapid drying will be facilitated. 
SEASONED PRODUCTS. 
Unfinished seasoned products—Injury by powder-post beetles to 
dry hardwood lumber and other material in stacks or storehouses can 
be prevented as follows: 
(1) Have a general inspection of the material in the yards and 
storehouses at least once a year, preferably during November or 
February, for the purpose of (a) sorting out and destroying or other- 
wise disposing of any material that shows the slightest evidence of 
injury, as indicated by the presence of fine powdery boring dust, and - 
(>) sorting out and destroying all old and useless sapwood material 
of any kind that will offer favorable breeding places for the insects. 
(2) Prevent the introduction into the lumber yards or storehouses 
of any infested material, remembering that the insect may be thus 
distributed to or from all parts of the world. 
(3) Adopt a system of classification of all dry or seasoned hard- 
wood stock which will provide for (a) the separation of the pure 
heartwood material from the pure and part sapwood material; (b) 
classification of all kinds of wood most lable to attack, such as hick- 
ory, ash, oak; (¢) the successive utilization or sale of the older ma- 
terial (remembering that material one year old or over is far more 
liable to injury); (d@) providing against the accumulation of refuse 
material in which the insects could breed; and (e) treating the best 
material with linseed oil or kerosene to prevent attack. 
Finished seasoned products—Damage to finished handles, oars, 
spokes, rims, hubs, wheels, and other unpainted wagon, carriage, 
machinery, and implement stock in factories, wholesale and retail 
storehouses, and army and navy stores can be prevented by the adop- 
tion of the same general rules as those given under rough products. 
Tn addition, damage can be controlled and prevented in the following 
manner: - 
Sort out and (a) destroy all articles showing the slightest evidence 
of powder-post injury, or (6) treat with kerosene oil such infested 
and slightly injured articles as may be tested for required strength 
and found to be of sufficient value for retention, placing the same in 
quarantine for a sufficient time to determine whether the treatment is 
successful. 
[Cir. 128] 
