. An annotated list of the important North American forest insects. Forest insects. PROTECTION OF LOG CABINS, ETC., FROM INSECTS greatlj' weakening it and causino; it to break oif read- ily. Tlie larvae also extend their work to the pith in such pieces, completely cle- stroyino- it and often liter- ally reducing it to powder. In the larger pieces of wood this insect confines its Avork more to the sapwood, and by the time the larvae are full grown they have destroyed nearly all of the sapwood. (Fig! 11.) The work of the larval borers is entirely in the interior of the log and can not be detecte
. An annotated list of the important North American forest insects. Forest insects. PROTECTION OF LOG CABINS, ETC., FROM INSECTS greatlj' weakening it and causino; it to break oif read- ily. Tlie larvae also extend their work to the pith in such pieces, completely cle- stroyino- it and often liter- ally reducing it to powder. In the larger pieces of wood this insect confines its Avork more to the sapwood, and by the time the larvae are full grown they have destroyed nearly all of the sapwood. (Fig! 11.) The work of the larval borers is entirely in the interior of the log and can not be detectecl without chopping into the wood. The borings are of the same texture as those of the adult ambrosia beetles but are packed tightly in the mines behind the larvae. "When the borings are loos- ened they break up into cakes. Occasionally the in- jury is not noticed until the wood has been worked up into the finished product (fig. 12) and the emerging beetles leave holes that in- dicate the destruction which has been going on unnoticed inside of the manufactured article. Hickory and persimmon woods used in the manufac- ture of shuttle blocks, mal- lets, mauls, etc., are liable to severe injury by this in- sect, sometimes suffering a 50 per cent loss. (Figs. 11 and 12.) ROUNDHEADED BOREES. FiGUliE 9.—Piece of hickory with Ihr liaiU and a little of the wood removed, rev(>nliii£;- tunnel of an adult powder-post Ijeetle, Xylobiops basilare. Entrance hole is shown at tip of arrow, and the gallery is seen extending on each side. Larvae, pupae", and emerging adults are shown in their cells. Natural size The roimdheaded borers have a remarkable varia- tion in general appearance. (Fig. 13.) The beetles range in length from less than one-fourth inch to more than li/* inches. They also vary considerably in the place and the manner of laying their eggs. The adult beetles lay (heir eggs (1) on top of the bark" (fig. 14), or (2), if the bark is ^ Chion cinctus Drury. •46
Size: 1015px × 2461px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
