THE RELATION OF NATIVE GRASSES TO PUCCINI A 

 GRAM IN IS IN THE REGION OF IOWA, WEST- 

 ERN ILLINOIS, WISCONSIN, SOUTHERN 

 MINNESOTA AND EASTERN SOUTH 

 DAKOTA 



L. H. PAMMBL 



During the summer and fall of 1918 the writer made, under the 

 auspices of the Cereal Investigations of the U. S. Department of 

 Agriculture, a study of the distribution of some of our native grasses 

 and their relation to Puccinia graminis. The region embraced Iowa, 

 western Illinois and Wisconsin, southern and western IMinnesota and 

 eastern South Dakota. 



Dr. E. C. Stakman and F. J. PiemeiseF have given us the most 

 complete list of the species of grasses on which Puccinia graminis 

 and the various biologic forms occur. The paper is a most ex- 

 haustive one, recording the results of a large number of carefully 

 conducted experiments. The paper shows in an interesting way the 

 interrelations between the different host plants and the significance 

 of the biologic forms of rusts on different grasses and cereals. 



The authors state that the following hosts have been found in- 

 fected in nature: Agropyron caninum (L.) Beauv., A. cristafitiu, J. 

 Gaert., A. Smithii Rydb., A. spicatum (Pursh) Rydb., A. tenerum 

 Vasey, Elymus bracJiystachys Scribn. and Ball. E. canadensis L., E. 

 niacouniiVasey, E. robustus Scribn. and J. G. Sm., E. virguiiciis L., 

 Hordeum cccspitosum Scribn., H. juhatum L., H. pusilliim Nutt., 

 H. vulgare L., Hystrix patula Moench., Sccalc ccrcalc L., Triticuni 

 compactum Host., T. dicoccnm Schr., T. durum Desf., T. monococ- 

 cum L., T. polonicum L., T. spclta L., T. tnrgidum L., T. rulgarc Vill. 



Hosts easily infected artificially: Agropyron clongatiim Host., 

 Bromus hordeaccus L., B. pnmila, B. tcctoriim L., Hordeum spon- 

 taneum K. Koch., H. vulgare (Abyssinian), H. vulgare pallidum 

 Ser.. H. vulgare pallidum subvar. pyramidatum. 



The Puccinia graminis compacti occurs on the following hosts in 

 the field: Agropyron Smithii Rydb.. Elymus canadensis, E. conden- 



iBiologic Forms of Puccinia graminis on Cereals and Grasses : Journal 

 Agrl. Research, 10: 429-495, pi. 5S-59. 



