Economic entomology for the farmer Economic entomology for the . economicentomolo00smit_0 Year: 1896 THE INSECT WORLD. plish its mission,—the fertilization of the female. After this the life histories differ greatly ; sometimes the female lives through the winter in the partly-grown or adult condition ; sometimes she lays eggs which fill up the entire space beneath the scale, the insect itself shrivelling up until scarcely a trace remains. Some- times living young are brought forth, and there may be one or several broods. Hence it is necessary to study each species in detail before w
Economic entomology for the farmer Economic entomology for the . economicentomolo00smit_0 Year: 1896 THE INSECT WORLD. plish its mission,—the fertilization of the female. After this the life histories differ greatly ; sometimes the female lives through the winter in the partly-grown or adult condition ; sometimes she lays eggs which fill up the entire space beneath the scale, the insect itself shrivelling up until scarcely a trace remains. Some- times living young are brought forth, and there may be one or several broods. Hence it is necessary to study each species in detail before we can say much on the subject of remedies. It is obviously beyond the province of this book to describe all the injurious species, and general statements only are possible. Fig. 86. Oyster-shell scale, Mytilaspis poniorum.—a, female scale, from beneath, filled with eggs ; b, same, from above ; c, twig infested by female scales ; d, male scale and a twig infested therewith. Perhaps the most common forms of this series are the ' * oyster- shell' bark-lice, of which we have several species, deriving their common name from the fact that the scales have a marked resem- blance to the shells of some oysters. In the Northern United States Mytilaspis pomorum is the common form, infesting apple
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