. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 312 FUNGOUS DISEASES OF PLANTS XVIII. EARLY BLIGHT OF CELERY Cercospora Apii Fr. Atkinson, Geo. F. Note on the Cercospora of Celery Blight. Cornell Agl. Exp. Sta. Built. 48: 314-316. fig. j. 1892. Duggar, B. M. Early Blight of Celery. Cornell Agl. Exp. Sta. Built. 132: 201-206. figs. 48-50. 1S97. Sturgis, W. C. On the Prevention of Leaf-Blight and Leaf-Spot of Celery. Conn. Agl. Exp. Sta. Rept. 21: 167-171. 1897. U. S. Dept. Agl. Rept. (1886): 117-120. Habitat relations. Cercospora
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 312 FUNGOUS DISEASES OF PLANTS XVIII. EARLY BLIGHT OF CELERY Cercospora Apii Fr. Atkinson, Geo. F. Note on the Cercospora of Celery Blight. Cornell Agl. Exp. Sta. Built. 48: 314-316. fig. j. 1892. Duggar, B. M. Early Blight of Celery. Cornell Agl. Exp. Sta. Built. 132: 201-206. figs. 48-50. 1S97. Sturgis, W. C. On the Prevention of Leaf-Blight and Leaf-Spot of Celery. Conn. Agl. Exp. Sta. Rept. 21: 167-171. 1897. U. S. Dept. Agl. Rept. (1886): 117-120. Habitat relations. Cercospora Apii is the cause of the chief disease of celery, beginning early in the season. It is common in the Atlantic states and well known in the Mississippi Valley. It is also a serious pest in Europe. In the early stages of the disease there is a well- defined spot with slightly raised bor- der ; but when the spots become numerous on a leaf, the latter begins to turn yellow, and subsequently the fungus develops abundantly its conid- iophores in indefinite areas, thus giv- ing the characteristic ashen or velvety spots of indiscriminate form. When a leaf becomes seriously injured it wilts and dries. The conidia are then produced in quantity over the whole surface, particularly during muggy days; thus the dead leaves increase many times the chances of further in- fection. This disease does not usually appear late in the season, being fre- quently followed by the late blight (Septoria Petroselini var. Apii) with which it has no genetic con- nection. This fungus also occurs on cultivated and wild parsnip (Pastinaca sativd) and other related plants. The fungus. The conidiophores and conidia of this Cercospora are in no way particularly characteristic. The conidiophores and spores are variable in size, depending upon the conditions under. Fig. 145. Cercospora Apii: Ab- normal Fruiting in Culture. Please note that these images are extracted from scanned page images that may have been digit
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