Additions to the List op^ Plant Diseases of Economic 

 Importance in Indiana.^ 



Geo. a. Osner. 



The following list of plant diseases represents collections and observa- 

 tions made by the \\Titer and other members of the staff of the Department 

 of Botany of the Agricultural Experiment Station at various times during 

 the summer, in connection with other work. With these have been included 

 collections made by students in the Department of Biology of Purdue Uni- 

 versity under the direction of Prof. G. N. Hoffer to whom thanks are due for 

 his hearty co-operation. 



The past season was extremely dry and hot during the mid summer 

 months, thus reducing materially the damage due to fungus and bacterial 

 diseases. However, in spite of this dry weather, several plant diseases, new 

 to Indiana, were discovered that were causing very material loss to the crops 

 concerned. These losses are mentioned in the proper place in the following 

 list. 



It is hoped to add to this list from year to year until a more or less com- 

 plete survey of the important plant diseases of this state shall have been 

 ol)tained. Specimens of the plant diseases listed are retained in the herbarium 

 of the Department of Botany, Agricultural Experiment Station, of Purdue 

 University where they are available for examination by any one interested. 

 Unless otherwise stated, the collections were made by the writer. 

 APPLE, (Pyrus Malus L.) 



Leaf Spot. 



Coniothyrium pirinuni Shel. Scott, White, July, 1916; Tippecanoe, 



Sept., 1916; Boone, July, 1916 (P. S. Lowe). This disease was quite 



common during the past season. 



Coryneum foliicolum Fckl. Boone, August, 1916 (P. S. Lowe). This 



fungus was found accompanying Coniothyrium pirinurn Shel. and Phyl- 



losticta pirina Saec. (See also under pear.) 



Illosponum malifoliorum Shel. Jefferson, Sept., 1916 (E. Coppess). 

 Phijllosticta pirina Saec. Boone, July, 1916 (P. S. Lowe); Wayne, 



August, 1916 (R. E. Wilson). This fungus frequently accompanies 



Sphaeropsis Malorum Pk. and Coniothyrium pirinurn Shel. 

 BEAN, {Phaseolus vulgaris L.) 



Blight. 



Bacterium Phaseoli E. F. Sm. Marshall, August, 1916; Pulaski, 



Tippecanoe, Sept., 1916; Sullivan, July, 1916 (J. C. Summers); Boone, 



August, 1916 (P. S. LoAve). This disease caused quite severe loss in 



northern Indiana during the past season. 



1. This list is supplementary to "A List of Plant Diseases of Economic Importance 

 in Indiana" by F. J. Pipal. Ind. Acad. Sci. Proc. 1915. 



(327) 



