. Circular. Insects. Circular no. 54. United States Department of Agriculture, DIVISION OF ENTOMOLOGY. L. O. HOWARD, Entomologist. THE PEACH-TREE BORER.* (Sannina exitiosa Say.) By C. L. Marlatt, Entomologist in Charge of Experimental Field Work. GENERAL APPEARANCE AND METHOD OF WORK. The brownish, gummy exudations, more or less soiled with earth and the larval excrement, about the bases of peach trees, and also, to a less extent, of the cherry and plum and other stone fruits, are familiar to. Fig. 1.—Sannina exitiosa: a, adult female ; b, adult male ; c, full- grown larva; d, female pupa; e,
. Circular. Insects. Circular no. 54. United States Department of Agriculture, DIVISION OF ENTOMOLOGY. L. O. HOWARD, Entomologist. THE PEACH-TREE BORER.* (Sannina exitiosa Say.) By C. L. Marlatt, Entomologist in Charge of Experimental Field Work. GENERAL APPEARANCE AND METHOD OF WORK. The brownish, gummy exudations, more or less soiled with earth and the larval excrement, about the bases of peach trees, and also, to a less extent, of the cherry and plum and other stone fruits, are familiar to. Fig. 1.—Sannina exitiosa: a, adult female ; b, adult male ; c, full- grown larva; d, female pupa; e, male pupa; f, pupa skin par- tially extruded from cocoon—all natural size (original). all growers. These exudations indicate the presence of the peach-tree borer, which undergoes its development just within the bark, mining between the bark and the sap wood, often completely girdling and causing the death of trees, and always greatly injuring and weakening them. The parent of this larva is not often seen. It is a very slender, dark-blue moth, wasp-like in appearance, and presenting remarkable differences between the two sexes. The mimicking of the wasp is especially noticeable in the case of the male insect, the wings of which are transparent, bordered with steel-blue, which is the general color of the body in both sexes. The fore-wings of the female are blue and clothed with scales, while the hind-wings are transparent, resembling those of the male. The middle of the abdomen of the female is marked by a broad orange band covering the fourth, or fourth and fifth seg- ments. The male expands about one inch and the female an inch and a half or more. ORIGIN AND DISTRIBUTION. The peach-tree borer is a native species, and was described by Thomas Say, of Philadelphia, early in the last century. It had then been * This circular replaces No. 17, new Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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