PART III 



FUNGOUS DISEASES OF PLANTS 



CHAPTER VII 



, GENERAL CLASSIFICATION 



I. FUNGOUS DISEASES AND PATHOLOGY 



Comes, D. O. Crittogamia agraria. 600 pp. 17 ph. 1891. 



Frank, A. B. Die Krankheiten der Pflanzen (Pilzparasitaren Krankheiten) 



2: 574 pp. 95 figs. 1896. Breslau. 

 Freeman, E. M. Minnesota Plant Diseases (Report of the Survey, Bot. Series 



V). 432 pp. 211 figs. 1905. St. Paul. 

 Hartig, R. Lehrbuch der Baumkrankheiten. 3d ed. 324 pp. 250 figs. 



1900. Berlin. (2d ed. transl. into English by Somerville and Marshall 



Ward. 331 pp. 1 5Q figs. 1894.) 

 Kuhn, J. Krankheiten der Kulturgewachse. 312 pp. 7 pis. 1858. Berlin. 

 Massee, G. Text-book of Plant Diseases. 458 pp. 92 figs. 1896. 

 Prillieux, Ed. Maladies des plantes agricoles et des arbres fruitiers et fores- 

 tiers cause"es par des parasites ve'ge'taux 1 : 421 pp. 190 figs. j 2 : 592 pp. 



figs. 191-484. ■ 

 Smith, W. G. Diseases of Field and Garden Crops. 353 pp. 143 figs. 1K84. 

 Sorauer, P. Pflanzenkrankheiten 2 : (2d ed.) 456 pp. 18 pis. 21 figs. 1889. 



Berlin. (3d ed. revised by Lindau. 562 pp. 62 figs. 1908.) 

 Tubeuf, K. von, and Smith, W. G. Diseases of Plants induced by Crypto- 



gamic Parasites. 598 pp. 330 figs. 1897. 

 Unger, F. Die Exantheme der Pflanzen und einige mit diesen verwandte 



Krankheiten der Gewachse. 422 pp. 7 pis. 1833. 

 Ward, H. Marshall. Timber and Some of its Diseases. 295 pp. 45 figs. 



1889. 

 Ward, H. Marshall. Diseases in Plants. 309 pp. 1901. 



If we interpret disease as any apparently abnormal condition of 

 an organism or of its parts or functions, it is evident that the 

 diseases of plants, like those of other living things, include mor- 

 phological and physiological disturbances which may be induced 

 by a variety of environmental factors, living or nonliving. The 

 popular conception excludes from the category of plant diseases 

 those effects caused by predatory animals or by sudden mechanical 



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