LIST OF DISEASES OF ECONOMIC PLANTS & 



COMMON NAMES OF DISEASES 



The following principles, some of which have been adopted by 

 the American Phytopathological Society, 2 have been used in select- 

 ing the common names in the present list. Many of these names 

 have already been passed upon and approved by the society. 



(1) First consideration has been given to names already in wide and general 

 use. 



(2) Names descriptive of symptoms have been selected where practicable. 



(3) In general, the various diseases caused by a single organism on different 

 hosts have been given the same common name. 



(4) Many diseases which are not sufficiently well known or important to re- 

 ceive a descriptive name have been classed according to their major symptoms; 

 for example, leaf -blight, root-rot, rust, and wilt. 



(5) It is assumed that the generic name of the causal organism may be pre- 

 fixed to such common names whenever it is deemed desirable. Such generic 

 names have not, however, been repeated in this list. 



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Fig. 2— Geographic areas used inthe list: Western States, Missouri Valley States, Southern States, 



and Great Lakes States 



It # is hoped that as many of these common names as prove con- 

 venient and satisfactory for practical purposes will be generally 

 adopted, in order that they may become fixed and definite in their 

 application and thus secure uniformity and stability. 



DISTRIBUTION 



An endeavor has been made to give in a brief form the geographic 

 range of each species as correctly as the available information will 

 permit. Diseases reported from a few or widely scattered States are 

 followed by lists of these States. Diseases which have been re- 

 ported from a number of States in which the host crop is grown or 

 grows naturally are indicated as "general." Diseases which have 

 been reported from a large number of States and in different parts 

 of the country are indicated as "widespread." If a disease occurs 



2 Shear, C. L. Report of the seventh annual meeting of the American Phytopathological Society. In 

 Phytopathology, vol. 6, pp. 211-212. 1916. 



