474 



Journal of Agricultural Research 



Vol. X, No. 9 



Table 'KX^.— Results of inoculations with urediniospores of Puccinia graminis secalis — 



Continueci 



o Only a few of the results with wheat are recorded here; they will appear later. 



The results of the survey work and of the inoculations with known 

 strains of P. graminis secalis can be summarized as follows : P. graminis 

 secalis has been found on the following hosts in the field: Agropyron 

 caninum (L.) Beauv., A. cristatum J. Gaert., A. smithii Rydb., A. repens 

 (L.) Beauv., A. ienerum Vasey, Elymus canadensis L., E. robustus Scribn. 

 and J. G. Sm., Hordeum juhatum L., H. pusillum Nutt., H. vulgare I,., 

 Hysirix patula Moench., Secale cereale L., Sporobolus cryptandrus (Torr.) 

 Gray. 



In addition to the above, the following have been easily infected by 

 artificial inoculation: Agropyron elongatum Host., Bromus tectorum L., 

 Elymus virginicus L., Hordeum spontaneum K. Koch, H. vulgare pallidum 

 Ser., H. vulgare pallidum subvar. pyramidatum. 



The following have been weakly infected artificially: Agropyron imbri- 

 catum Roem., and Schult., A. intermedium, Beauv., A. sibericum Beauv., 

 Avena saiiva L., Bromus purgans L., Triiicum vulgare Vill. 



Inoculated but not infected: Agropyron desertorum Schult., Agrostis 

 alba L., A. stolonijera Vasey, Alopecurus geniculatus L,., A. pratensis h-, 

 Anthoxanthum odoratum L., Arrhe-natherum elatius (L-.) Beauv., Avena 

 fatua ly., Dactylis glomerata L., Holcus laruitus L., Koeleria crisiata (L.) 

 Pers., Lolium perenne It., Phalaris canariensis h., Triticum compactum 

 Host. 



Little work has been done on the wild hosts for P. graminis secalis in 

 this country. Carleton (6. p. 6o) reports successful infection of rye and 

 barley, but not of wheat, with — 

 what seemed to be uredospores of P. graminis from Hordeum jubatum 



and concludes in a preliminary way that Hordeum jubatum supports two 

 distinct forms of P. graminis. These two forms, in the light of the writers' 



