. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 122 FUNGOUS DISEASES OF PLANTS Burrill, T. J. Blight of Pear and Apple Trees. 111. Indus. Univ. Rept. 10 : 583-597- Jones, L. R. Studies upon Plum Blight. Centrbl. f. Bakt. Paras, u. Infek- tionskr. 9 (Abt. II): 835-841. 1902. Waite, M. B. Cause and Prevention of Pear Blight. Year Book U. S. Dept. Agl. (1895): 295-300. Waite, M. B. Pear Blight and its Control in California. State Hort. Com. of Calif. (Special Report) (1906): 1-20. Whetzel, H. H. The Blight Canker of Apple Trees. Co
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 122 FUNGOUS DISEASES OF PLANTS Burrill, T. J. Blight of Pear and Apple Trees. 111. Indus. Univ. Rept. 10 : 583-597- Jones, L. R. Studies upon Plum Blight. Centrbl. f. Bakt. Paras, u. Infek- tionskr. 9 (Abt. II): 835-841. 1902. Waite, M. B. Cause and Prevention of Pear Blight. Year Book U. S. Dept. Agl. (1895): 295-300. Waite, M. B. Pear Blight and its Control in California. State Hort. Com. of Calif. (Special Report) (1906): 1-20. Whetzel, H. H. The Blight Canker of Apple Trees. Cornell Univ. Agl. Exp. Sta. Built. 236: 103-138. Jigs. 50-83. 1907. Pear blight has been known in the United States for more than a century. Various common names have since been applied to this disease, determined largely by the host plant upon which it was found, and by the par- ticular effect produced upon the host. Such names there- fore as fire blight, twig blight, blossom blight, and other more or less similar designa- tions have been applied. Geographical. This disease was first reported from the northeastern United States, but its occurrence was subse- quently established in states to the south, west, and south- west, and by 1878 it was evi- dently very well established throughout the United States east of the Mississippi. Still later it became an important bacterial disease in the far West and Southwest. It is certainly distributed throughout the United States at present, but so far as is known, it does not occur in Europe or in Asia. There is every indication that the disease had its original home in the eastern United States, and its original host was doubtless some species of crab apple or thorn tree. Its gradual spread westward, therefore, was governed by the spread of civilization and the consequent greater contiguity of Fig. 31. Pear Tree Practically Dead from Severe Attack of Pear Blight (Photograph by H. H. Whetzel). Please note that these images are e
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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
