Insects injurious to fruits . arter of 294 INSECTS INJURIOUS TO THE GRAPE. Fig. 805. an incli 1(mi<x and one-fourth as wide, containiiij^ a solitaryorange-yellow larva, about one-eighth of an ineh long. Thisis also the larva of an undeterminecl species of Cecidomyiaya family the members of which may be recognized in thelarval state by a peculiar appendage known as a breast-boneattached to the under side near the head. In this species itis almost Y-shaped, as shown at a in the figure; the diverging branches terminate in two pro-jecting points, which may beextended at will, and which areproba
Insects injurious to fruits . arter of 294 INSECTS INJURIOUS TO THE GRAPE. Fig. 805. an incli 1(mi<x and one-fourth as wide, containiiij^ a solitaryorange-yellow larva, about one-eighth of an ineh long. Thisis also the larva of an undeterminecl species of Cecidomyiaya family the members of which may be recognized in thelarval state by a peculiar appendage known as a breast-boneattached to the under side near the head. In this species itis almost Y-shaped, as shown at a in the figure; the diverging branches terminate in two pro-jecting points, which may beextended at will, and which areprobably used by the larva inabrading the soft tissues of thegall so as to cause an exudationof sap, on which the larva flies belonging to this genusare usually of a dull-black color,like that shown in Fig. 305, a,which represents a female fly; the antenna of a mi^le is seenat b. The gall is common in July ; the larger-sized specimensbear some resemblance to a bunch of filberts or hazel-nuts,hence the name No. 168.—The Grape-vine Tomato-gall. Vitis tomalos lliley. These galls form a mass of irregular, succulent swellingson the stem and leaf-stalks of the grape-vine (see Fig. 306),very variable in size and shape, from the single, round, cran-berry-like swelling to the irregular, bulbous protuberanceswhich look much like a grouj) of diminutive tomatoes. Theyhave a yellowish-green exterior, with rosy cheeks, and some-times are entirely red; the interior is soft, juicy, and gall has several cells, as shown at a in the figure, andin each cell there is an orange-yellow larva, which, before thegall has entirely decayed, enters the ground, where it changesto a pupa, and finally emerges as a pale-reddish gnat, withblack head and antennae, and gray wings. This fly also be- ATTACKING THE LEAVES. 295 longs to the family Cecidomyia, and is known to entomologistsas Lasioptera vitis of Osten Sacken. The larvae are liable to be attacked by a parasite, and also
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Keywords: ., bookauthorsaunderswilliam183619, bookcentury1800, bookdecade1880
