. The American fruit culturist, containing directions for the propagation and culture of all fruits adapted to the United States. Fruit-culture. DESTRUCTIVE INSECTS. 165. sickly trees; they inhabit both the trunk and limbs of a tree, and, besides apple, pear, peach, and apricot trees, they also attack a variety of forest trees. They are chiefly injurious to young trees. The eggs are laid in crevices of the bark, and the larvae (Pig. 217) get their growth in one year, living mostly just beneath the bark. The pupal stage (Fig. 220), lasting about three weeks, is passed in a cell made in the soli
. The American fruit culturist, containing directions for the propagation and culture of all fruits adapted to the United States. Fruit-culture. DESTRUCTIVE INSECTS. 165. sickly trees; they inhabit both the trunk and limbs of a tree, and, besides apple, pear, peach, and apricot trees, they also attack a variety of forest trees. They are chiefly injurious to young trees. The eggs are laid in crevices of the bark, and the larvae (Pig. 217) get their growth in one year, living mostly just beneath the bark. The pupal stage (Fig. 220), lasting about three weeks, is passed in a cell made in the solid wood. The beetles emerge in May and June through ellip- tical-shaped holes. Trees badly infested with this borer should be burned at once. The remedial measures ad- vised for the round- 'leaded borer may also 36 applied against the flat-headed species. Scale-Insects are minute sucking insects, which now rank among the most destructive fruit pests in many parts of the country. We can here discuss only a few of the more com- mon ones. The Oyster-shell Bark-louse (^Mytilaspis pomorum).—This scale (Fig. 222) is very common on apple-trees all over the country; it also attacks many forest trees, and it is found all over the world. It is shaped somewhat like an oyster-shell, and is nearly the color of the apple bark. In northern latitudes there is but a single annual generation of the insect; in the South there are two. It usually confines its attacks to the bark of younger branches, but sometimes occurs on the fruit in the North. If the scale be tipped over during the winter, it will present the appearance seen at a in Fig. 221; that is, the shrivelled body of the female is tucked away at one end, and from 30 to 90 white eggs occupy the rest of the scale. The winter is passed in the egg, and the young lice usually hatch in the Fig. 217. Fig. 218. Fig. 219. Fig. 220. The Flat-headed Apple-tree Borer. Fig. 217.—Larva or grub. FIG. 218.—Beetle. Fig. 220.—Pupa. All twice natura
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