94 FUNGOUS DISEASES OF PLANTS 



means. There is also a tendency to dissociate from plant diseases 

 proper the widespread devastation which is the result of the varied 

 injuries annually inflicted by insects. In general, therefore, .we 

 may disregard insects as the cause of plant diseases when that 

 term is applied narrowly. 



It is within comparatively recent times that the specific injuries 

 or modifications of climatic or other physical factors of the envi- 

 ronment have been carefully studied. When properly understood, 

 these effects have moreover frequently been termed " physiolo- 

 gical " as opposed to "pathological." With a broad definition of 

 pathological this interpretation would be illogical. Nevertheless 

 the student of fungous diseases of plants has been the chief plant 

 pathologist. This is partially due to the fact that the disease-pro- 

 ducing fungi are intimately associated with the structure of plants, 

 and a proper study of the fungus has necessitated a thorough com- 

 prehension of its relation to the plant upon which it grows, the 

 host. Plant diseases and plant pathology are, therefore, more or 

 less synonymous with fungous diseases of plants, and the narrow 

 use of the term plant pathology will on this account doubtless 

 long persist. 



II. THE CLASSES OF FUNGI 



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(Extensive; in 13 parts; illustrated.) 1872-1905. 



COOKE, M. C. Introduction to the Study of the Fungi. 360 pp. 148 figs. 1895. 

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