Insects injurious to fruits . l winding channel, whichsoon becomes filled with gum. As it increases in size, itdevours the bark and sap-wood, and causes a copious exuda-tion of gum, which eventually forms a thick mass around thebase of the tree, intermingled with the castings of the full grown (see Fig. 204), the larva measures over halfan inch in length, and nearly a quar-_iG. 204. |.gj, Q^ ^jj jj^^j^ jj^ diameter. It is a naked, soft, cylindrical grub, of a palewhitish-yellow color, with a reddish,horny-looking head and black jaws ;the upper part of the next segment is similar in a
Insects injurious to fruits . l winding channel, whichsoon becomes filled with gum. As it increases in size, itdevours the bark and sap-wood, and causes a copious exuda-tion of gum, which eventually forms a thick mass around thebase of the tree, intermingled with the castings of the full grown (see Fig. 204), the larva measures over halfan inch in length, and nearly a quar-_iG. 204. |.gj, Q^ ^jj jj^^j^ jj^ diameter. It is a naked, soft, cylindrical grub, of a palewhitish-yellow color, with a reddish,horny-looking head and black jaws ;the upper part of the next segment is similar in appearanceto the head, but of a paler shade. The under surface resem-bles the upper in color; the three anterior pairs of claw-likefeet are tj)ped with brown ; the five hinder pairs of thick,fleshy prolegs are yellow, each of the latter margined with afringe of very minute reddish-brown hooks. There are a fewscattered hairs over the surface of the body, each arising froma pale-reddish, wart-like dot. The larvae may be found of. ATTACKING THE TRUNK. I93 different sizes all through the fall and winter months, somequite young associated with others nearly full grown. Duringthe winter the larger ones rest, with their heads upwards, insmooth, longitudinal grooves which they have excavated, theback part being covered with castings mingled with gum andsilken threads, forming a kind of cell, the cavity of which isconsiderably larger than the worm inhabiting it; the smallerones usually lie in the gum, or between it and the wood of thetrunk or root. In badly-infested trees the whole of the barkat the base or collar is sometimes consumed for an inch or twobelow the surface. Nor does the insect always confine itselfto the base of the tree; occasionally it attacks the trunk fartherup, and sometimes the forks of the limbs; but the exudinggum invariably points out the spot where the foe is at work. When about to become a pupa, the larva crawls upwardsto the surface of the ground, and construct
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Keywords: ., bookcentury1900, bookdecade1900, bookidin, booksubjectinsectpests
