﻿532 



Dodge: Effect of host on Gymxosporangiu 



The table shows that of the eleven cedars not having son in 

 1 914 five which were not inoculated developed no sori in 191 5. 

 Six were inoculated and four of them bore sori in 1915. Ten 

 plants had sori in 191 4 and all of these were inoculated, seven of 

 them producing teleutospores in 191 5. The first to show infection 

 had been put in the cold frame October 29 and was brought in 

 December 9. Two son were discovered January 22. Eight more 

 had been formed on this plant by March 12. 



This teleutospore material was used in making further inocula- 

 tions of Amelanchier and Aronia to check up the results obtained 

 in 1914. Owing to the limited supply of spores on February 22, 

 the sori of germinating spores were rubbed on the individual 

 leaves of Amelanchier. Over infection resulted and many of the 

 leaves were killed. The results of the experiments are given in 

 Table III. 



Infection experiments with spores from leaves of potted plants of Cham- 

 nsformans in 1914 





There were ten different plants of Amelanchier including three 

 species. Two numbers of Aronia were also used. The absence 

 of failures may be attributed to the care taken in making the inocu- 

 lations, and to the vigorous condition of the plants. These experi- 

 ments (except number 447) were made before any teleutospore 



