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The Cercospora Leaf Spot of Rose Caused by Mycosphaerella rosicola

B. H. Davis

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Abstract

SUMMARYIn this study on the Cercospora leaf spot of rose, an ascigerous stage found on overwintered leaves is connected with the conidial stage, Cercospora rosicola Pass. As a survey of the literature reveals no ascigerous stage specifically identical with this one, the combination Mycosphaerella rosicola (Pass.) comb. nov. is proposed. The known suscepts are listed and the range, importance, and symptoms of the disease are given. The pathogenicity is proved by inoculation experiments.A comparative study of the Cercosporae described in the literature as occurring on the rose shows that there are in reality but three species. These are C. Rosae (Fuckel) v. Höhn., C. rosicola Pass, and C. hyalina Muller and Chupp. Descriptions and synonymy of these species are given. In the course of the study a fourth species of Cercospora collected in the southern United States was studied and is described as new under the name Cercospora Puderii.

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SUMMARYIn this study on the Cercospora leaf spot of rose, an ascigerous stage found on overwintered leaves is connected with the conidial stage, Cercospora rosicola Pass. As a survey of the literature reveals no ascigerous stage specifically identical with this one, the combination Mycosphaerella rosicola (Pass.) comb. nov. is proposed. The known suscepts are listed and the range, importance, and symptoms of the disease are given. The pathogenicity is proved by inoculation experiments.A comparative study of the Cercosporae described in the literature as occurring on the rose shows that there are in reality but three species. These are C. Rosae (Fuckel) v. Höhn., C. rosicola Pass, and C. hyalina Muller and Chupp. Descriptions and synonymy of these species are given. In the course of the study a fourth species of Cercospora collected in the southern United States was studied and is described as new under the name Cercospora Puderii.

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Available abstract

SUMMARYIn this study on the Cercospora leaf spot of rose, an ascigerous stage found on overwintered leaves is connected with the conidial stage, Cercospora rosicola Pass. As a survey of the literature reveals no ascigerous stage specifically identical with this one, the combination Mycosphaerella rosicola (Pass.) comb. nov. is proposed. The known suscepts are listed and the range, importance, and symptoms of the disease are given. The pathogenicity is proved by inoculation experiments.A comparative study of the Cercosporae described in the literature as occurring on the rose shows that there are in reality but three species. These are C. Rosae (Fuckel) v. Höhn., C. rosicola Pass, and C. hyalina Muller and Chupp. Descriptions and synonymy of these species are given. In the course of the study a fourth species of Cercospora collected in the southern United States was studied and is described as new under the name Cercospora Puderii.

Key concepts: Cercospora, Mycosphaerella, Leaf spot, Biology, Rose (mathematics), Botany, Horticulture

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