Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 SEPTORIA. 477 cultivated parsley in Europe and Britain enemy of celery in the United States. S. armoraciae Sacc. On horse-radish in America. S. consimilis Ell. et Mart, frequents lettuce in America. S. lycopersici Speg. This parasite, originally observed in America, has recently been de- scribed by Briosi and Cavara on tomatoes in Italy. It causes spots on leaves, stems, and fruits, inflicting thereby
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 SEPTORIA. 477 cultivated parsley in Europe and Britain enemy of celery in the United States. S. armoraciae Sacc. On horse-radish in America. S. consimilis Ell. et Mart, frequents lettuce in America. S. lycopersici Speg. This parasite, originally observed in America, has recently been de- scribed by Briosi and Cavara on tomatoes in Italy. It causes spots on leaves, stems, and fruits, inflicting thereby con- sidei'able loss on cultivators. The following are im- portant forms on other cultivated plants : S. graminum Desm. causes light spots on leaves of wheat, oats, and brasses. It has been observed to injure the cereal crop in Italy, It is recorded for Britain and America. S. cannabis (Lasch.). This on leaves of hemp pro- duces spots, which are at first whitish, then yellowish with dark margins. The pycnidia are embedded in the upper side of the leaf. The following species have caused injury to garden plants: S. dianthi Desm. Car- nation-spot,- The disease appears on the leaves and stems as rounded spots of A variety {(ipii Br. et Cav.) is an Fio. 297.—a, Leader-shoot of Spruce, partially killed and defoliated, b, Pycnidia emerging from the rind and the leaf-scars (x o). c, Formation of oonidia inside a pycnidium (x 240). rf, Spores germinating in water. ., Spores germinating in nutritive gelatine. (After R. Hartig.) 1 Cavara ( Pflauzenkrankheilen, in., p. 23) regards this and S. tritici with its varieties, as forms of a single species; also Eriksson {Om Nagra sjukdomar d odlade Vdxter, 1890). -Atkinson, ' Carnation Diseases,' at American Carnation Society, 1893.
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