. Les insectes nuisibles pour les fruits. Illustré de quatre cent quarante coupes de bois. Les insectes nuisibles. 296 LES INSECTES NUISIBLES À LA VIGNE. Fig. 307. comme celle d'un écrou-noisette, à la tige de la vigne. Sur sa surface externe il y a des dépressions longitudinales, qui divisent le culot en huit ou neuf segments. L'intérieur est charnu pour environ un huitième de son diamètre, puis suivre une série de cellules allongées, chacun divisé en tw^o par une cloison transversale, la partie inférieure étant le plus court des deux. Fig. 307, a, représente l'extérieur de la galle ; 6, une section de la même, montrant sa structure intérieure

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. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. 296 INSECTS INJURIOUS TO THE GRAPE. Fig. 307. like that of a hazel-nut, to the stem of the vine. On its ex- ternal surface there are longitudinal depressions, which divide the gall into eigHt or nine segments. The interior is fleshy for about one-eighth of its diameter, then follow a series of elongated cells, each divided into tw^o by a transverse partition, the lower being the shorter of the two. Fig. 307, a, represents the exterior of the gall; 6, a section of the same, showing its interior structure. Each cell is occupied by a single larva of a bright-yellow color, with a chestnut-brown, Y-shaped breast-bone, which eventually produces a gall-fly belonging to the genus Cecidomyia. This gall sometimes varies in form, being occasionally flat- tened or depressed; when young it is downy on the outside, succulent within, and is said to have a pleasant, acidulous flavor. Should any of the galls described ever become a source of annoyance, they may readily be destroyed by hand-picking.. ATTACKING THE FEUIT. No. 170.—The Grape-seed Insect Isosoma vitis Saunders. This insect was first observed in 1868, when it threatened to become a very troublesome enemy to grape-culture; it was widely distributed, and, having the fecundity usually charac- teristic of insect life, it might have been expected to increase immensely; but this happily has not been the case, and of late it has seldom prevailed to any serious extent.. 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 work.. Saunders, William, 1836-1914. Philadelphia, J. B. Lippincott & Co

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