214 
Journal of Agricultural Research 
Vol. XXIX, No. 5 
cycle; and the conditions which favor 
or inhibit its development. Above all, 
it is important that the utmost effort 
be made to confine this rust to its 
present known range in the Western 
States, for if one may judge, of its 
possible behavior under conditions of 
greater humidity and more favorable 
temperature, from what is known of 
its ravages in Europe, its importance 
as a limiting factor in the production 
of wheat would scarcely be second to 
that of stem rust. 
HOSTS 
Not unlike Puccinia graminis Pers., 
P. glumarum is found on a relatively 
large number of both wild and culti¬ 
vated Gramineae. Investigation has 
shown that definite specialized forms 
exist, such, for example, as those com¬ 
mon to wheat and barley which, ac¬ 
cording to Eriksson and Henning (4), 
are sharply fixed. In Europe, where 
this rust has long been common, the 
following hosts have been recorded: 
Calamagrostis epigeios (L.) Roth, Ely- 
mus arenarius L., Hordeum jubatum, 
H. vulgare L., Aegilops triuncialis L. 
(Triticum triunciale (L.) Rasp.), Secale 
cereale L., T. vulgare Vill., T. turgidum 
L., T. spelta L., T. repens L. (Agropyron 
repens (L.) Beauv.), 7\ polonicum L., 
T. giganteum Roth, T. durum Desf., 
T . monococcum L., T. dicoccum Schrank, 
T. desertorum Fisch. (Agropyron deser- 
torum Schult.), T. compactum Host., 7\ 
caninum Ledeb. (Agropyron caninum 
L.), and Dactylis glomerata L. Doubt¬ 
less it has other hosts among the wild 
grasses of Europe, Asia, and Africa, 
such, for example, as other species of 
Agropyron, Bromus, Elvmus, and Hor¬ 
deum, but record of such is absent from 
the literature seen. One species parti¬ 
cularly, Agropyroti cristatum (L.) 
Gaertn., occurring naturally in Europe, 
and especially in Russia, has proved a 
most congenial host of P. glumarum in 
America, though it is not reported as 
such in Europe. 
In North America, stripe rust thus 
far has been reported as occurring 
naturally on the following hosts: Agro¬ 
pyron spicatum (Pursh) Scribn. and 
Smith, A. cristatum (L.) Gaertn., A . 
dasystachum (Hook.) Scribn., A. inter¬ 
medium (Host.) Beauv., A. violaceum 
(Hornem.) Lange, A. lanceolatum 
Scribn. and Smith (A. riparium J. G. 
Sm.?), A. desertorum Schult., Bromus 
marginatus Nees, B. pad ficus Shear, 
B. sitchensis Trin., B. carinatus Hook, 
and Arn., B . carinatus v. hookerianus 
(Thurb.) Shear, B . rubens L., B. 
brizaeformis Fisch. and Mey., B. poly¬ 
anthus Scribn., Elymus canadensis L., 
E. condensatus Presl., E. glaucus Buckl., 
E. macounii Vasey, E. striatus Willd., 
E. virginicus L., Hordeum caespitosum 
Scribn., H . jubatum L., H. gussoneanum 
Pari., H. murinum L., H. nodosum L., 
H. pusillum Nutt., H. vulgare L., 
Hystrix patula Moench, H. californica 
(Boland.) Kuntze, Phalaris paradoxa 
L., Sitanion jubatum J. G. Smith, 
S. hystrix (Nutt.) J. G. Smith, S. 
longifolium J. G. Smith, Secale cereale 
L., Triticum vulgare Vill., T. polonicum 
L., T. compactum Host., T. durum 
Desf., T. spelta L., and T. dicoccum 
Schrank. 
Thus far the writers have failed to 
note the occurrence of stripe rust on 
Dactylis glomerata in America, nor has 
it been possible for them to produce 
infection by artificial means, in spite 
of conditions highly favorable to inocu¬ 
lation and subsequent incubation. 
These facts would seem to indicate 
that there are inherent differences 
between the European and American 
forms of the rust or that the European 
and American forms of the host are not 
entirely identical. 
DESCRIPTION OF STRIPE RUST 
The aecial stage of Puccinia glumar um 
is unknown. Eriksson and Henning 
(4) report inoculation experiments with 
teliospores on various species of Borag- 
inaceae, but in all instances they 
obtained only negative results. A 
further and more exhaustive study, 
however, may result in the discovery 
of the aecial host. Because one has 
not yet been found, is not sufficient 
justification for assuming its non¬ 
existence, or that the rust, having 
formerly required such a host, may, 
under less exacting conditions, have 
lost its capacity for aecial develop¬ 
ment. 
EXPLANATORY LEGEND FOR PLATE 1 
a. Leaves with characteristic stripelike lesions; 6, portion of culm showing fine stripes of telia; c, shriveled 
kernels from head of a severely rusted plant; d , ventral and dorsal views of glumes showing telia. 
