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The паше of
parasite.
The degree of
specialisation
of parasite.
The list of genera and
species of cereals attacked
by the fungus.
The cultiva­
ted plant on
which the
pansite
usuallylives.
Are there immune
varieties to this,
parasite?
Tilletfa tritici
Wint.
Puccinia
coronifera.
Eryslphegra-
minis DC. f.
avenae.
E. graminis f.
tritici.
E. graminis f.
hordei.
Puccinia
simplex.
Puccinia glu-
marum f. hor­
dei.
P. giumarum
f. tritici.
Puccinia
triticina.
Helminthos-
poriumgraml-
neum Rabh.
weak. All 8 species of culti­
vated wheat, Aegilops cy-
lindrica, A. ventricosa.
Wheat.
medium. Avena; but not all spe­
cies; non attacked are A.
clatior L-., A. byzantina
and other (Vavilov)
> Oats.
middle. Avena, but not all spe­
cies; non infected are: A.
sempervirens, A. bromoi-
des, A. brevis.
Oats.
narrow. Triticum sativum in a Wheat.
broad sense; some varieties
of T. dicoccum are absolu­
tely immune
narrow. Ilordeum vulgare: Barley.
narrow. Hordeum vulgare. Barley.
narrow. Hordeum vulgare. Barley.
narrow. Triticum sativum. Wheat.
narrow. Triticum sativum. Wheat.
narrow Hordeum vulgare. Barley.
N o 1).
T h e r e a r e ;
mostvarietiesbelon-
ging to A. sativa
are susceptible.
T h e r e a r e ;
most varieties are
susceptible.
T h e r e a r e ; a
large number of
immune varieties.
There are; acon­
siderable number
There are—a con­
siderable numb.
There are—a con­
siderable numb.
T h e r e a re—a
very great number..
T h e r e a r e—a
large number.
There are—a con­
siderable number
The same regularity is to be observed in many other plants to other
diseases. E .g . Plasmodiophora brassicae does not distinguish even such diffe­
rent genera of Cruciferae, as Barbarea, Arabis, Lepidium, Raphanus, etc...
Hence it is quite, natural that, notwithstanding many attempts to find
'varieties of cabbage really immune to this fungus, such have not been found
and cannot be found.
Sclerotinia trifoliorum infects not only TrifoUum, but Medicago, Onob-
rychis and other genera of Papilionaceae, hence there are no varieties of
clover immune to this fungus.
On the other hand many species of parasitic fungi, belon­
ging to Perenosporaceae, Erysiphaceae, Uredinaceae are narrowly specia­
lised, hence the existence of varieties immune to these parasites.
E. g. Melamspora lini Tul. is very narrowly specialised and the biolo­
gical race of this fungus, which attacks ordinary flax does not infect other
Kirchner in his papers (the last of 1916) indicates a number of varieties of wheat
immune to stinking smut. But many of these immune varieties proved to be susceptible
in Hocke’s experiments, as well as "in the author’s experiments (e. g. T. monocoecumr
T. durum var. affine) and the author doubts the immunity (at least physiological) of the
other varieties of Prof. Kirchner. The method of infection used by Prof. Kirchner is-
not irreprovable.
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