Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . Fig. 27. Twig infested by Scurfy Bark-louse. a native of America, having been known to the ear-liest American entomologists, and is supposed tohave fed on wild crab apples before the introductionof improved fruit trees. The scales of the male louseare much narrower than those of the female. During May or June the eggs beneath these scaleshatch into small, purplish or reddish-brown lice, thatcrawl about over the bark for a few days, and finally INJURING THE LEAVES. 67 Insert thei
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . Fig. 27. Twig infested by Scurfy Bark-louse. a native of America, having been known to the ear-liest American entomologists, and is supposed tohave fed on wild crab apples before the introductionof improved fruit trees. The scales of the male louseare much narrower than those of the female. During May or June the eggs beneath these scaleshatch into small, purplish or reddish-brown lice, thatcrawl about over the bark for a few days, and finally INJURING THE LEAVES. 67 Insert their tiny beaks to suck the sap. Having thusfixed themselves they gradually de-velop, until by fall the females haveattained the shape represented at theleft of Fig. 28, and the size shownat the right of the same figure. Theeggs are deposited beneath the scale,and remain in this position until thefollowing spring. Remedies.—The treatment recommended on aprevious page (p. 34) for the Oyster-shell Bark-louse,is equally applicable to the present Fig. 28. Scale of Fe-male. Magnified. INJURING THE LEAVES. The Pear-tree Slug. Selandria leaves of pear, cherry, quince and plum treesare frequently attacked during June and July by agreenish-black, slimy slug, that eats the parenchymaoff the upper surface. This is the Pear or CherrySlug. It originates from eggs laid early in June, inthe leaf, by a four-winged black fly (shown slightlymagnified at Fig. 29). The eggs hatch about twoweeks after they are deposited, and the larvre becomefull grown in four or five weeks. They are thennearly half an inch long, and of the form repre-sented at Fig. 29. They now shed their slimy skin,appearing in a clean, }^ellow suit that is not sticky, 68 INSECTS AFFECTING THE PEAR. and shortly afterwards leave the tree. Havingreached the ground they enter the soil two or threeinches, and form an oval cavity in the earth, which
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