. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 264 FUNGOUS DISEASES OF PLANTS XLIV. APPLE SCAB AND PEAR SCAB Venturia Pomi (Fr.) Wint and Venturia Pyrina Aderh. Aderhold, Rud. Die Fusicladien unserer Obstbaume. Landwsch. Jahrb. 25: 875-914. pis. 29-31. 1896; Ibid. 29: 541-587. 1900. Beach, S. A. Experiments in Preventing Pear Scab in 1893. N. Y. Agl. Exp. Sta. Built. 67: 183-204. Clinton, G. P. Apple Scab. 111. Agl. Exp. Sta. Built. 67: 109-156. 1901. (Good bibliography.) Duggar, B. M. Some Important Pear Diseases. Co
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 264 FUNGOUS DISEASES OF PLANTS XLIV. APPLE SCAB AND PEAR SCAB Venturia Pomi (Fr.) Wint and Venturia Pyrina Aderh. Aderhold, Rud. Die Fusicladien unserer Obstbaume. Landwsch. Jahrb. 25: 875-914. pis. 29-31. 1896; Ibid. 29: 541-587. 1900. Beach, S. A. Experiments in Preventing Pear Scab in 1893. N. Y. Agl. Exp. Sta. Built. 67: 183-204. Clinton, G. P. Apple Scab. 111. Agl. Exp. Sta. Built. 67: 109-156. 1901. (Good bibliography.) Duggar, B. M. Some Important Pear Diseases. Cornell Agl. Exp. Sta. Built. 145: 616-622. figs. 168-170. 1898. Lawrence, W. H. The Apple Scab in Western Washington. Washington Agl. Exp. Sta. Built. 64: 1-24. pis. 1,2. 1904. Smith, Ralph E. Pear Scab. Calif. Agl. Exp. Sta. Built. 163: 1-18. figs. 1-0. 1905. Two important fungous diseases popularly known as apple and pear scab have received at the hands of both mycologists and horticulturists considerable attention within the past thirty years. The fungi causing these diseases are very closely related, al- though quite generally re- ferred to two distinct species. The conidial form of each of these fungi was first found parasitic upon its respective host; hence these fungi have long been known by the names of these conidial forms, Fusi- cladium dendriticum and Fiisicladium Pyrinum. More recently an ascomy- cetous fungus, Venturia Pomi, has been found to constitute the perfect stage of the apple scab organism, and a related perithecial form, Venturia Pyrina, has been connected with the pear scab fungus. The perithecial stages develop saprophytically, a phe- nomenon characteristic of many Ascomycetes. Distribution and climatic relations. In the United States both the scab of the apple and of the pear are widely Fig. 116. A Severe Attack of Pear Scab on Flemish Beauty. Please note that these images are extracted from scanned page images that may have been digitally
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