448 



Journal of Agricultural Research 



Vol. X, No. 9 



Table XVII. — Results of inoculations with urediniospores from Elymus ro'oustus Scribn. 



and f . G. Sm. 



Puccinia graminis secalis occurred on Elymus rohustus in all four lots 

 of material from which inoculations were made (Table XVI). A small 

 amount of P. gramims tritici, however, was present on the first two lots 

 collected. The grass is about equally susceptible to both the rye and 

 wheat forms of stemrust, this fact being very clearly demonstrated by 

 a great many inoculation experiments. E. rohustus, like E. canadensis, 

 may be severely rusted in the field. In the epidemic of 1916, however, 

 it did not seem to be so universally and severely attacked as some of the 

 species of Agropyron and Hordeum juhatum. Just why this was so is 

 difficult to say. Certainly E. rohustus is quite as susceptible as these 

 other grasses in the greenhouse. However, on account of its habit of 

 growth, conditions for infection may not be so favorable in the field. 



Table XVIII. — Results of inoculations with urediniospores from Festuca elatior L. 



No. 



Place. 



Ames, Iowa 



Madison, Wis.o 



Bellingham, Wash. 

 Sheridan, Wyo . . . . 



Date. 



1916. 

 July I 



...do 



Sept 7 



Oct. 9 



Triticum 



vulgare. 



O 

 27 



Avena 

 saliva. 



O 

 25 



14 

 31 



26 



;4 



Hordeum 

 vulgare. 



O 



18 



28 



;6 



i-r '6 



Phleutn 

 pretense. 



30 



O 

 30 



21 

 21 



a Very few spores were viable when inoculations were made. 



The rust on Festuca elatior was Puccinia graminis phleipratensis in 

 both cases where successful infection occurred (Table XVIII). This was 

 easily determined both by the morphology of the spores and the nature 

 of the uredinia developed on oats and barley. The comparatively small 



