Fungous diseases of plants . ries. The organism attacks thefibrovascular bundles, — the etiology of the disease is not unlikethat of Pscjidomonas Stezvarti Erw. Smith, — and a constantsymptom is the excessive developmeni; in the bundles of a yellowgum. IX. PSEUDOMONAS: OTHER SPECIES Among other phytopathological species of special importancein certiiin regions, yet less well known, or imperfectly reportedupon, are the following: Pseudomonas Juglandis Pierce is a parasite of the English orPersian walnut {Juglans rcgia) in California.^-^ Young nuts andshoots are affected, and the disease is one
Fungous diseases of plants . ries. The organism attacks thefibrovascular bundles, — the etiology of the disease is not unlikethat of Pscjidomonas Stezvarti Erw. Smith, — and a constantsymptom is the excessive developmeni; in the bundles of a yellowgum. IX. PSEUDOMONAS: OTHER SPECIES Among other phytopathological species of special importancein certiiin regions, yet less well known, or imperfectly reportedupon, are the following: Pseudomonas Juglandis Pierce is a parasite of the English orPersian walnut {Juglans rcgia) 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. Report of the Plant Pathologist to July i, 1906. Calif. Agl. Built. 184: 232-236. figs. 2-4. 1907. SCHIZOMYCETES. BACTERIA 121 Pseudomonas malvacearum luw. 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 Srui 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 (Vnylovonis (Burrill) De Toni Arthur, J. C. Diseases of the Pear. N. Y. Agl. Exp. Sta. Rcpt. 3 : 357-367- , J. C. Histology and Biology of Pear Blight. 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 BuRRiLL, T. J. Anthrax of Fruit Trees; or the so-called Fire Blight of Pear, or Twig Blight of Apple Trees. 111. Indus. Univ. Kept. 10 : , L. R. Studies upon Plum Blight. Centrbl. f. Bakt. Paras, u. Infek- tionskr. 9 (Abt. II): 835-841. , M
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