Insects injurious to fruits . e very injurious. It is said to be destroyed byIchneumon jflies, species of Pimpla, furnished with very longovipositors, with which they bore into the trunks of treesinhabited by these Tremex larvae, and deposit their eggs inthem: these hatch into grubs, which consume their substanceand cause their death. ATTACKING THE BEANOHES. Fig. 149. No. 67.—The Twig-girdler. Oncideres cingulatus (Say). This beetle nearly amputates pear twigtiduring the latter half of August and the earlyQ part of September. The female makes per-^ forations (Fig. 149, 6) in the smaller branch
Insects injurious to fruits . e very injurious. It is said to be destroyed byIchneumon jflies, species of Pimpla, furnished with very longovipositors, with which they bore into the trunks of treesinhabited by these Tremex larvae, and deposit their eggs inthem: these hatch into grubs, which consume their substanceand cause their death. ATTACKING THE BEANOHES. Fig. 149. No. 67.—The Twig-girdler. Oncideres cingulatus (Say). This beetle nearly amputates pear twigtiduring the latter half of August and the earlyQ part of September. The female makes per-^ forations (Fig. 149, 6) in the smaller branches7 of the tree upon which she lives, and in thesedej)osits her eggs, one of which is shown of thenatural size at e. She then proceeds to gnawa p-roove about one-tenth of an inch wide andabout a similar depth all around the branch,as shown in the figure, when the exterior por-tion dies, and the larva, when hatched, feedsupon the dead wood. The girdled twigs sooneror later fall to the ground, and in them the insect completes. ATTACKING THE BRANCHES. 143 its transformations, and finally escapes as a perfect insect is about eleven-twentieths of an inch in length,with a robust body of a brownish-gray color with dull red-dish-yellow dots, and having a broad gray band across themiddle of the wing-cases. The antennae are longer than thebody. The beetle is more common on the hickory than onthe pear. To subdue the insect, the dead and fallen twigs should btgathered and burnt. No. 68.—The Pear-blight Beetle. Xylehorus pyri (Peck). During the heat of midsummer, twigs of the pear-tree some-times become suddenly blighted, the leaves and fruit wither,and a discoloration of the bark takes place, followed by thespeedy death of the part affected. Most frequently these effectsare the result of fire-blight, a disease produced by a speciesof micrococcus, but occasionally they are due to the agencyof the pear-blight beetle. In these latter instances there willbe found, on examinatio
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