Diagram 1. Illustrating the Inter-continental Migration of Plant Diseases.
No. 1, Potato blight: Chili-Colorado-Europe. No. 2, Asparagus rust: Europe, 1805; New jersey, 1896, South Carolina, 1897; Michigan, 1898; Illinois, 1899; Dakota, Nebraska and Texas, 1900; California, 1901. No. 3, potato cercosporose: Europe, 1854; United States, 1903. No. 4, rice smut: Japan-South Carolina, 1898. No. 5, sorghum smut: Japan-United States 1884. No. 6, grape anthracnose: Europe-America, 1880, or earlier, now widespread. No. 7, cucumber downey mildew: Cuba 1868; United States, 1889. No. 8, grape black rot: North America, early France, 1885; Italy and the Caucausus, 1898. No. 9, potato wart: Hungary, 1896; England, 1900; Newfoundland, 1909; Boston and New York, 1910. No. 10, grape downey mildew: America early; France, 1873; The Rhineland, Savoy and Italy, 1879; The Tyrol and Algiers, 1880; Portugal and Greece, 1881; Alsace, 1882; the Caucausus 1887; Brazil, 1890. Now known in all countries except Australia. No. 11, grape powdery mildew: United States, early; England, 1845; Belgium and France, 1848; all Europe, 1849; Madeira, 1852. Known everywhere now. No. 12, chrysanthemum rust: Japan-England, 1895; America, 1896.
