. Nature study and life. Nature study. ;i6 NATURE STUDY AND LIFE subsist on the juices of their host by means of piercing and sucking mouth parts. In the Lecaniums, or nalced scale insects, the scale is the insect itself. In the majority of species, however, the scale is an armor composed of powdery, waxy, or even cal- careous substance, together with moulted skins, excreted by the insect and beneath which it lives. Several species. Fig. 92. Branch of Willow Tref killed bv 0^â STER-SHELL .Scale Inslcis (About natural size) furnish valuable commercial products, notably the cochi- neal insect, C
. Nature study and life. Nature study. ;i6 NATURE STUDY AND LIFE subsist on the juices of their host by means of piercing and sucking mouth parts. In the Lecaniums, or nalced scale insects, the scale is the insect itself. In the majority of species, however, the scale is an armor composed of powdery, waxy, or even cal- careous substance, together with moulted skins, excreted by the insect and beneath which it lives. Several species. Fig. 92. Branch of Willow Tref killed bv 0^â STER-SHELL .Scale Inslcis (About natural size) furnish valuable commercial products, notably the cochi- neal insect, Coccus cacti, from which cochineal and carmine are derived, and Cartcria lacca, living on the branches of several tropical trees, from which we get shellac; but our common species are among the most troublesome and destructive of insect pests. Like the plant lice they mul- tiply with great rapidity, and their scaly coverings tend to protect them from the oily or soapy washes and sprays commonly used to kill insects by 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 Hodge, Clifton Fremont, 1859-. Boston and London, Ginn & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatures, bookyear1902
