JOURNAL OF AGMOILTHRAL RESEARCH 
Vol. XXV Washington, D. C., September i, 1923 No. 9 
SPECIALIZED VARIETIES OF PUCCINIA GLUMARUM, 
AND HOSTS FOR VARIETY TRITICI 1 
By Charles W. Hungerford, 2 Agent, Office of Cereal Investigations , Bureau of Plant 
Industry, and Plant Pathologist of the Idaho Agricultural Experiment Station , and 
C. E. Owens, Associate Professor of Botany and Plant Pathology, Oregon Agricul¬ 
tural College, and formerly Assistant Pathologist, Office of Cereal Investigations, Bureau 
of Plant Industry, United States Department of Agriculture 
INTRODUCTION 
Since the discovery of stripe rust in the United States, in 1915, a 
systematic study of the disease has been conducted by the Office of 
Cereal Investigations of the Bureau of Plant Industry, United States 
Department of Agriculture, in cooperation with the Oregon Agricultural 
Experiment Station, and, later, with the Idaho Agricultural Experiment 
Station. This paper is the third of a series of contributions to our 
knowledge of stripe rust in the United States. Former papers (2, 10) 3 
have dealt with the economic importance and geographical distribution 
of the disease and with the life history, taxonomy, and morphology of 
the causative organism. This paper will deal with the known hosts 
of the rust, our present knowledge of its specialized varieties, and with 
the comparative susceptibility of certain wheat varieties to Puccinia 
glumarum tritici Erikss. & Henn., as indicated by field and greenhouse 
experiments. 
HOSTS 
Eriksson (4), in his original report upon Puccinia glumarum , when it 
was separated from the now obsolete Puccinia rubigo-vera (DC.) Wint., 
named wheat, barley, rye, Elymus arenarius , and Agropyron repens as 
hosts for the new form. SacCardo (16, p. 380) lists the following hosts: 
Brachypodium sihaticum, Bromus mollis, Calamagrostis epigeios , Hor- 
deum vulgare , Secale cere ale, Triticum caninum , T. comp actum, T . dicoccum , 
T. desertorum , T. distichon , T. durum , T. giganteum , T. polonicum , 
T. repens . Hecke (7) reports the unpublished work of K. Barfus in 
which he lists Dactylis glomerata as an additional host. 
1 Accepted for publication May 2, 19 23 . The investigations upon which this paper is based were con¬ 
ducted cooperatively by the Office of Cereal Investigations, Bureau of Plant Industry, U. S. Department 
of Agriculture, and the Oregon and Idaho Agricultural Experiment Stations. 
2 The writers wish to acknowledge with gratitude the hearty cooperation of Prof. G. R. Hyslop, Mr. 
J. Allen Clark, and Mr. D. E. Stephens in furnishing wheat varieties for this study, and to thank Mr. C. R. 
Hursh, Mr. J. T. Bregger, and Mr. J. C. Bell for their aid in taking notes, and Prof. H. P. Barss, Dr. H. B. 
Humphrey, and Dr. A. G. Johnson for helpful suggestions during the progress of the work and in the 
preparation of this report. We also wish to express our appreciation for the valuable assistance given by 
Dr. A. S. Hitchcock and Mrs. Agnes Chase in the determination of the grasses used in the studies herein 
reported. 
3 Reference is made by number (italic) to “Literature cited,” p. 400-401. 
Journal of Agricultural Research, 
Washington. D. C. 
agf 
Vol. XXV, No. 9 
Sept. 1, 1923 
Key No. G-327 
60094—23-1 
( 363 ) 
