. A manual for the study of insects. Insects. Fig. 196.—The Pea-rtree Psylla, greatly enlarged. Fig. 197.—Venation of Wing's: j, stigma; c, clavus; c. s., claval suture. The most destructive member of this family in the United States is the Pear-tree Psylla, Psylla pyricola (Psyl'la py-ric'o-la). This is a minute species, measuring only one- tenth inch in length to the tip of the folded wings (Fig. 196). But it occurs in such large numbers that it has destroyed extensive pear orchards, by sucking the sap from the smaller limbs and twigs. It can be destroyed by spraying the infested trees with
. A manual for the study of insects. Insects. Fig. 196.—The Pea-rtree Psylla, greatly enlarged. Fig. 197.—Venation of Wing's: j, stigma; c, clavus; c. s., claval suture. The most destructive member of this family in the United States is the Pear-tree Psylla, Psylla pyricola (Psyl'la py-ric'o-la). This is a minute species, measuring only one- tenth inch in length to the tip of the folded wings (Fig. 196). But it occurs in such large numbers that it has destroyed extensive pear orchards, by sucking the sap from the smaller limbs and twigs. It can be destroyed by spraying the infested trees with kerosene emulsion imme diately after the leaves have expanded in the spring. Family APHIDID^ (A-phid'i-dae). The Plant-lice or Aphids {^Aph'ids), The plant-lice are well-known insects; they infest nearly all kinds of vegetation in all parts of the country. Our most common examples are minute, soft-bodied, green insects, with long legs and antennae, which appear on various plants in the house and in the field. Among our common species are both winged and wingless forms (Fig. Fig. 198.—a Group of Aphids. 198), There are a great number of species, nearly all 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 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
