Manufactured unseasoned products are subject to damage from ambrosia beetles and other wood borers.

Seasoned hardwood lumber of all kinds, rough handles, wagon stock, etc., made partially or entirely of sapwood, are often reduced in value from 10 to 90 per cent by a class of insects known as powder-post beetles.

Finished hardwood products such as handles, wagon, carriage and machinery stock, especially if ash or hickory, are often destroyed by the powder-post beetles.

Construction timbers in buildings, bridges and trestles, cross-ties, poles, mine props, fence posts, etc., are sometimes seriously injured by wood-boring larvae, termites, black ants, carpenter bees, and powder-post beetles, and sometimes reduced in value from 10 to 100 per cent.

In tropical countries termites are a very serious pest in this respect.
MARINE WOOD-BORER INJURIES Vast amounts of timber used for piles in wharves and other marine structures are constantly being destroyed or seriously injured by marine borers.