. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. 150 INSECTS INJURIOUS TO THE PEAR. usually draws two leaves together and fastens them with silken fibres, or else folds one up and eats the surface, making unsightly blotches, which Fig. 156. Fig. 157. disfigure and injure the leaves. About the mid- dle of August, the larva changes to a long, slender chrysalis within this mine (Fig. 157, also magnified). The moths appear a few days after- wards. When its wings are expanded, the moth (Fig. 158, en- larged) measures about one-third of an inch across.
. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. 150 INSECTS INJURIOUS TO THE PEAR. usually draws two leaves together and fastens them with silken fibres, or else folds one up and eats the surface, making unsightly blotches, which Fig. 156. Fig. 157. disfigure and injure the leaves. About the mid- dle of August, the larva changes to a long, slender chrysalis within this mine (Fig. 157, also magnified). The moths appear a few days after- wards. When its wings are expanded, the moth (Fig. 158, en- larged) measures about one-third of an inch across. The fore wings are dark gray, with a round blackish spot on the middle of the inner edge\of tho wing, which is not shown in the figure, also an eye-like spot on the outer edge, with a black pupil. As the season advances, these insects sometimes become very abundant, and towards the end of autumn a large pro- portion of the leaves of the pear and apple trees become blotched and disfigured from their work. Since they pass the winter in the larval or chrysalis condition in their leafy en- closures, their numbers may be materially reduced by gathering all the fallen leaves in the autumn and burning them. Fig. No. 75.—The Pear-tree Slug. Selaiidria cerasi Peck. In the year 1790, Prof. Peck, of Massachusetts, wrote a pamphlet entitled ^^ Natural History of the Slug-worm/^ which was printed in Boston the same year by order of the Massachusetts Agricultural Society and was awarded the So- ciety's premium of fifty dollars and a gold medal. Although more than ninety years have passed since that pamphlet was written, not much has been added in the interval to our knowledge of the history and habits of this insect. In the mean time, however, it has spread over the greater portion 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
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherphila, bookyear1883
