202 



Proceedings of Indiana Academy of Science 



INDIANA PLANT DISEASES, 1922.^ 



Max W. Gardner-, Purdue University. 



This is the fourth of a series of annual summaries of the plant dis- 

 ease situation in the state (2)^ Attention is confined mostly to the dis- 



D3PAHTUR3S FRO'J NORLUl TEMPERiTTOE 1922 



Ficr. 1. Departures from normal temperature and piccipitation based on monthly 

 averages, 1922. 



eases of economic importance on agricultural crops. No claim for com- 

 pleteness is made. The diseases are arranged alphabetically by hosts. 



Weather Conditions. 



Temperature and rainfall have a very marked effect upon the preva- 

 lence of most diseases. The graphs in figure I represent the departures 



' Contribution from the Botanical Department, Puidue University Agricultuial Ex- 

 periment Station, Lafayette, Indiana. 



- Tlie writer wishes to acknowledge the assistance and co-operation of H. S. .lackson, 

 E. B. Mains, C. T. Gregory, G. N. HofFer, .1. B. Kendrick, C. L. Burkholder, F. P. 

 Cullinan, H. D. Brown and F. C. Gaylord. 



' Numbers in parenthesis refer to "literature cited". 



"Proc. Ind. Acad. Sci., vol. 33, 1923 (1924)." 



