. A manual for the study of insects. Insects. 44 THE STUDY OF INSECTS. is a dry season, it infests fruit-trees in the open air. As it thrives only in a dry atmosphere, it can be subdued upon house-plants by a liberal use of water. When it occurs upon plants in the open air it can be combated with any of the washes found useful in destroying scale insects. Some of the mites that infest plants produce galls. These galls are of various forms, but differ from those pro- duced by gall-flies (Family Cynipidce of the Order Hymen- opterd) in having open mouths, from which the young mites escape. A com
. A manual for the study of insects. Insects. 44 THE STUDY OF INSECTS. is a dry season, it infests fruit-trees in the open air. As it thrives only in a dry atmosphere, it can be subdued upon house-plants by a liberal use of water. When it occurs upon plants in the open air it can be combated with any of the washes found useful in destroying scale insects. Some of the mites that infest plants produce galls. These galls are of various forms, but differ from those pro- duced by gall-flies (Family Cynipidce of the Order Hymen- opterd) in having open mouths, from which the young mites escape. A common disease of the pear, known , blister, is produced by a four-legged mite, PJiytopUis pyri (Phy-top'tus py'ri) (Fig. 52). The blisters characteristic of. Fig. s'^'—Phytoptus pyri, greatly enlarg-ed. the disease are swellings of the leaf, within which there is a cavity affording a residence for the mites. Figure 53 repre-. 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Comstock Pub. Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
