. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. 148 INJURIOUS INSECTS material damage, for the reason, doubtless, that there have, hitherto, always been natural enemies and parasites enough to keep it in due bounds. THE OYSTER-SHELL BAHK-LOUSE. {Mytilaspis pomicorticis, Riley.) The Oyster-shell Bark-louse, was formerly known as Aspidiotiis conchiformis, but changed by Prof. Riley for good reasons to the name given above. It is one of the most pernicious and destructive insects with which the apple-grower in the North- ern States has to contend. This s
. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. 148 INJURIOUS INSECTS material damage, for the reason, doubtless, that there have, hitherto, always been natural enemies and parasites enough to keep it in due bounds. THE OYSTER-SHELL BAHK-LOUSE. {Mytilaspis pomicorticis, Riley.) The Oyster-shell Bark-louse, was formerly known as Aspidiotiis conchiformis, but changed by Prof. Riley for good reasons to the name given above. It is one of the most pernicious and destructive insects with which the apple-grower in the North- ern States has to contend. This species presents the appearance of figure 99, and may always be dis- Kg. BiR^ tlnguishcd from the pre- I'OnsE. ceding, by having a very uniform mussel-shaped scale of an ash-gray color (the identical color of the bark), and by these scales, contain- ing, in the winter time, not red, but pure white eggs. There is scarcely an apple-orchard in Northern Illinois, in Iowa, or in Wisconsin, that has not suffered more or less from its attacks, and many an one has been slowly but surely bled to death by this tiny sap-sucker. It was introduced into the Eastern States about the beginning of the present century, from Europe, and had already reached as far west as Wisconsin in 1840, from whence it spread at a most alarming rate throughout the districts bordering on Lake Michigan. It occurs at the present time in Minnesota and Iowa, but whether or not it extends westward beyond the Missouri Eiver, there are no data to show. Its extension southward is undoubtedly limited, for though so abundant in the northern half of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Treat, Mary, b. 1835. New York, Orange Judd
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1887
