. L'encyclopédie de l'horticulture ; pratique un système de référence de l'horticulture commerciale, couvrant les phases pratiques et scientifiques de l'horticulture, en particulier pour les fruits et légumes ;. Jardinage ; culture ; fruits-légumes. Fig. 1. La rouille sur le feuillage et Cedar Apple ap- ple. (New Hampshire Experiment Station.) effets produits est la soi-disant "pommes de cèdre." Le champignon passe l'hiver sur les genévriers et, au printemps, produit des excroissances gélatineuses contenant des spores- numer. Ces spores, lorsque la charge retour à l'apple feuillage, produire la rouille à nouveau, un

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. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. Fig. 1. Rust on Apple Foliage and Cedar Ap- ple. (New Hampshire Experiment Station.) effects produced is the so-called "cedar apples." The fungus passes the winter on the Juniper and in the spring produces gelatinous outgrowths that contain numer- ous spores. These spores, when borne back to the apple foliage, produce the rust again, and thus the fungus passes from one host back to the other. Treatment Spraying has not usually been very effective in controlling the disease. Since the Junipers harbor the fungus through the winter the method of control is, obvi- ously, to destroy them. Charles Brooks The Pacific Coast Cedar Rust of the Apple, Pear, Quince and Related Pome Fruits Gymnosporangium hlasdaleanum For several years the writer has been studying a rust on several cultivated and native species of the pome family. In 1908 the fruiting stage of this rust was found on the serviceberry, and on the thorn apple or haw. Later the same spe- cies was found on the apple, pear, quince and the native pome fruits as noted be- low. The final stage of this rust is found on the incense cedar. * During the past six years the writer has paid particular attention to this rust, for the reason that it is of considerable economic importance. While it occurs rather sparingly on all varieties of apples so far observed, it has been found to at- tack certain varieties of pears very seri- ously. The quince is also subject to con- siderable injury by this rust. In 1910 and again in 1912 serious in- fections of this rust were noted in some orchards in the Rogue River valley. In 1912 the writer's attention was called to a very serious infection in a small block of pears of the Winter Nelis variety which practically destroyed 95 per c

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