379 



A List of Plant Diseases of Economic Importance 

 in Indiana with Bibliography. 



F. J. PlPAL. 



INTRODUCTION. 



Plant diseases cost Indiana considerably more every year than the 

 maintenance of all public schools in the State. In other words, they exact 

 an annual tax of over $15,000,000. The loss on the grain crops alone amounts 

 to about $11,000,000. The above estimates are based upon the results of 

 the experimental and demonstrational work conducted for a number of 

 years with grain smuts over a large section of the state, upon special reports 

 from cooperators in plant disease survey, general correspondence, and per- 

 sonal investigations and observations by the members of the Botanical and 

 other departments of the Agricultural Experiment Station. 



A considerable proportion of this damage to growing crops can be readily 

 and cheaply prevented by employing certain well-established, precautionary 

 measures. This has been clearly demonstrated in the disinfection of seed 

 grain by the formaldehydge treatment and in the spraying of fruit trees. 

 Other effective sanitary measures and methods of control are available, 

 which, if put into practice, will save yearly a neat sum of money. 



It is highly desirable, therefore, that Indiana farmers realize these facts 

 and avail themselves of the knowledge regarding plant diseases and their 

 control. A greater interest of the farmer in this phase of work will also add 

 stimulus to further and more extensive investigations of plant diseases so 

 that new and more practical measures of prevention and control can be 

 evolved and made available for general practice. 



In order to bring together the accumulated information regarding the 

 plant diseases that occur within the State the writer has made an attempt 

 in this paper to present a list and a bibliography of plant diseases in Indiana. 

 It is far from complete, however, and when a thorough survey is completed 

 many additions will be made to it. This list is merely intended to serve as 

 a foundation for plant disease surveys to be made in the future. 



With a few exceptions the list includes all plant diseases that have been 

 reported heretofore in various publications, and other diseases of which 



