. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ries. The organism attacks thefibrovascular bundles, — the etiology of the disease is not unlikethat of Pseicdomonas Stewarti Erw. Smith, — and a constantsymptom is the excessive development in the bundles of a yellow gum. IX. PSEUDOMONAS: OTHER SPECIES Among other phytopathological species of special importancein certain regions, yet less well known, or imperfectly reportedupon, are the following: Pseudomonas Juglandis Pierce is a parasite of the English orPersian walnut {Juglaiis rcgid) in California.^
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ries. The organism attacks thefibrovascular bundles, — the etiology of the disease is not unlikethat of Pseicdomonas Stewarti Erw. Smith, — and a constantsymptom is the excessive development in the bundles of a yellow gum. IX. PSEUDOMONAS: OTHER SPECIES Among other phytopathological species of special importancein certain regions, yet less well known, or imperfectly reportedupon, are the following: Pseudomonas Juglandis Pierce is a parasite of the English orPersian walnut {Juglaiis rcgid) in California.^^ Young nuts andshoots are affected, and the disease is one of much importance. 1 Pierce, N. B. Walnut Bacteriosis. Bot. Gaz. 31 : 272-273. 1901. 2 Smith, R. E. Repor*- of the Plant Pathologist to July i, 1906. Calif. Agl. Built. 184 : 232-236. figs. 2-4. 1907. SCHIZOMYCETES. BACTERIA 121 Pseudomonas malvacearum Erw. Smith. This parasite produces,through stomatal infections, water-soaked, angular areas (Fig. 30),known as angular leaf spot of cotton (Gossypium). Later these. Fig. 30. Angular Leak Spot of Cotton. (Photograph by Erwin F. Smith) spots turn purple and finally become dry and brown. The diseaseis apparently widely distributed in the southern states, but theorganism has not yet been fully described.^ X. PEAR BLIGHTBacillus amylovorus (Burrill) De Toni Arthur, J. C. Diseases of the Pear. N. Y. Agl. Exp. Sta. Rept. 3 : 357-367. , J. C. History and Biology of Pear Bhght. Proc. Phil. Acad. Nat. Sci. (1886): 322-341. pi. , T. J. Trans. 111. State Hort. Soc. (1877): 114: ibid. (1878): , T. J. Proc. Am. Assn. Adv. Sci. 29 : 583. 1880. 1 Smith, Erw. F. Bacteria in Relation to Plant Diseases 1 : 95, 126. 122 FUNGOUS DISEASES OF PLANTS BuRRiiL, T. J. Blight of Pear and Apple Trees. 111. Indus. Univ. Rept, 10 : 583-597-Jones, L. R. Studies upon Plum Blight. Centrbl. f. Bakt. Paras, u. Infek- tionskr. 9 (Abt. II): 835-841. , M.
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