. An annotated list of the important North American forest insects. Forest insects. FARMERS" BULLETIN 15 82 oak. The selection of the wood to be used for these purposes is often determined to a large extent by the local suppl3^ Hickory, ash, dog- wood, and persimmon, which are used in the manufacture of shuttle blocks, mallets, mauls, etc., are cut under very similar conditions and thus are subject to similar attack, and the protective measures de- scribed in this bulletin are equally applicable to stock cut for such purposes. Those woods which are probabh' most subject to insect attack a
. An annotated list of the important North American forest insects. Forest insects. FARMERS" BULLETIN 15 82 oak. The selection of the wood to be used for these purposes is often determined to a large extent by the local suppl3^ Hickory, ash, dog- wood, and persimmon, which are used in the manufacture of shuttle blocks, mallets, mauls, etc., are cut under very similar conditions and thus are subject to similar attack, and the protective measures de- scribed in this bulletin are equally applicable to stock cut for such purposes. Those woods which are probabh' most subject to insect attack and subsequent damage, if cut during certain seasons of the year, as explained on pages 14 and 15. are hickory, pine, persimmon, spruce, ash, and dogwood, although the others mentioned are b}^ no means immune. The damage can be largely prevented if proper measures are taken. From the standpoint of durability cedar, junii^er, and white oak are probably the most desirable of the woods listed above, especially where the wood comes in contact with the ground.^ CLASSES OF INSECTS RESPONSIBLE AND THE DAMAGE THEY DO The insects responsible for damage, in cases where the bark remains on logs used in rustic work, can be conveniently grouped into three main types or classes, according to their structure and the character of their work, n a m e 1 y, bark beetles,- ambrosia beetles,- and wood borers.^ The bark beetles confine their activities to the bark and burrow between it and the sapwood, often scoring the latter, the ambrosia beetles bore directly through the bark into the sapwood and sometimes the heartwood, and the wood borers may penetrate all three parts of the log. All three classes of these insects have four distinct stages, namely, the egg; the larva, also called worm or grub; the pupa, or transform- ing stage; and the adult, or beetle stage. Only the larval and adult stages are responsible for damage to woodwork. In all instances the larvae hatch from eggs laid by the beetles.
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
