Insects injurious to fruits . beingbrought towards the the larva has at-tained full size it remainsin its burrow, and enclosesitself in an oval cocoon(Fig. 8, b) formed of frag-ments of wood and barkcemented together with aglue-like secretion, and within this enclosure it is trans-formed into a pupa of a yellowish-white color. Through thepartially transparent membrane the limbs of the future beetleare dimly seen, and in due time the mature insect bursts itsfilmy covering, crawls through the passage previously gnawedby the larva, and emerges to the light of day. As this beetle affects
Insects injurious to fruits . beingbrought towards the the larva has at-tained full size it remainsin its burrow, and enclosesitself in an oval cocoon(Fig. 8, b) formed of frag-ments of wood and barkcemented together with aglue-like secretion, and within this enclosure it is trans-formed into a pupa of a yellowish-white color. Through thepartially transparent membrane the limbs of the future beetleare dimly seen, and in due time the mature insect bursts itsfilmy covering, crawls through the passage previously gnawedby the larva, and emerges to the light of day. As this beetle affects only old and decaying trees, it seldomdoes much harm. The use of the alkaline wash recommendedfor No. 2 would no doubt deter the beetles from depositingtheir eggs on trees so protected, and thus any mischief thevmight otherwise do could be prevented. No. 6.—The Apple-bark Beetle. Monarthrum. mail (Fitch). The apple-bark beetle is a small insect about one-tenth ofan inch long (see Fig. 9, where it is shown much magnified);. ATTACKING THE TRUNK. 25 it is cylindrical in form, smooth and slender, and varies incolor from dark chestnnt-brovvn to nearly black. Its legsand antennae are pale-yellowish, and its thorax minutelypunctated ; the posterior end of the body is abruptly notchedor excavated. The insect bores under the bark of apple-trees, sometimes attacking young, thrifty trees, which, whenbadly affected, are apt, soon after putting fcn-th their leaves,to wither suddenly, as if scorched by fire; the bark becomesloosened from the wood, and soon after, thesesmall beetles appear crawling through minute per-foi-ations in the bark like large pin-holes. Thisinsect usually appears in July; it is seldom verycommon, but has been reported as destructive insome parts of Massachusetts, where many youngtrees are said to have been ruined by it. So littleis yet known of the history and habits of this pest that it isdifficult to say what would be the best remedy for it. Fig. 9.
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Keywords: ., bookcentury1900, bookdecade1900, bookidin, booksubjectinsectpests
