﻿Dodge: Effect of : 



Gy 



531 



Aecidia had begun to ripen on the Aronias (see Table I) about 

 the middle of June and continued to shed spores for some time. 

 The method of inoculation employed consisted in putting several 

 cedars and Aronias bearing aecidia in the infection frame together 

 and, in addition, the cedars were sprayed with aecidiospores. 

 After two days in the frame, the plants were taken out and 

 stacked together on the bench. This treatment was repeated 

 two or three times with some of the cedars at intervals of about 

 a week. No attempt was made to infect the cedars with spores 

 from " Gymnosporangium fraternum on Amelanchier." 



Certain of these cedars were "sunk" in the garden during the 

 month of October and then put in the cold frame; others were left 

 in the greenhouse until December or January and then put in the 

 cold frame; those remaining were kept in the greenhouse all winter. 



Beginning about the first week in December the cedars were 

 removed from the cold frame one by one until all had been brought 

 in by March. A very careful inspection of the plants as they 

 were taken from the frame showed that no sori had developed. 

 The results may be summarized under the five groups into which 

 the plants may be divided according to their previous treatment 

 or condition. 



TABLE II 



Plants free from son in sprinK of 19x4 



Plants having sori in spring, 1914 



, . , 



Control, not inococulated 



I T ne T 1 - ' 







No. 



■-I - 



No. 



Result Date 





409 



t li 



1 





1 



348 

 349 



+ 



Jan.' 22 

 Feb! 19 



Mn 30 





winter; the others had bee 

 questionable assumptions tl 



i be more susceptible and t 



