. The American fruit culturist. ally covering it—in such casesoften killing it, if undisturbed, in a few years. It thrives onall kinds of fruit-trees, and on the small fruits as well as onmost other deciduous trees or shrubs; peaches usually suc-cumb to its attacks more quickly than any other can spread only by direct contact of theliving female with a live tree, either fromthe interlocking of the branches of an infestedtree with others, or by being carried fromone to another by birds or insects. Infestednursery stock is the most fertile source ofdistribution. While it is often
. The American fruit culturist. ally covering it—in such casesoften killing it, if undisturbed, in a few years. It thrives onall kinds of fruit-trees, and on the small fruits as well as onmost other deciduous trees or shrubs; peaches usually suc-cumb to its attacks more quickly than any other can spread only by direct contact of theliving female with a live tree, either fromthe interlocking of the branches of an infestedtree with others, or by being carried fromone to another by birds or insects. Infestednursery stock is the most fertile source ofdistribution. While it is often found on thefruit, there is yet no definite evidence thatsuch fruit was the source of any reason this scale is so much more dangerous than eitherof the two bark-lice just discussed is because of its greater Pig. 224. Fig. 225. The Scurfy Bark-louse. Fig. 224.—r, Female ; rf, male. Fig. 225.—Female scales. Fig. 226.—Male scales. Figs. 225, 226, natural size ; Fig. 224 enlarged. (U. S. Div. of Entomology.). •Fig. 227.—San JoseScale. (Greatlymagnified.) i68 DESTRUCTIVE INSECTS. power of rnultiplication. The insect winters in the form ofsmall round black scales scarcely larger than a pins become full grown in May or June, when they are ofa grayish color and nearly an eighth of an inch in is no egg stage, the young lice being born alive, andthey may become mothers in about forty days. Thus there arefrom three to five generations of the scales during a season,and as one mother may rear from one hundred to five hundred
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