6 i6 
Journal of Agricultural Research 
Vol. XXIV. No. 7 
Corvallis, Oreg., until they were headed but no rust appeared upon them. 
No rust infection could be found on this seed. Neither has the author 
been able at any time to locate any barley seed infected with P. 
glumarum. The work which is herein reported and the conclusions 
drawn relate to wheat only. 
The investigations were along two lines: (i) Greenhouse experiments 
in which large numbers of rusted wheat kernels were sown under isolated 
conditions and the resulting plants watched for infection; (2) field experi¬ 
ments in which rusted wheat kernels were sown in the field and the 
resulting plants kept under observation to learn if infection occurred 
upon them sooner than u^n plants grown from clean seed. 
SXP^RIMBNTS 
Rusted wheat seed has been sown for two years in comparison with 
clean seed and the resulting plants studied every few days for stripe- 
rust infection. The details and results of these experiments are given 
in tabular form, for each year separately. 
In the autumn of 1917, rusted seed and chaff from rusted heads of 
several varieties of wheat were saved and sown in an isolated place on 
the college farm, near Corvallis, Oreg. The details of the experiment 
and the results secured are given in Table III. 
These plots were examined carefully at frequent intervals in the fall 
and no stripe rust could be found on any of them at any time. In the 
spring the rust was slow to develop and did not spread rapidly, due to 
the extremely dry weather. 
In 1919, a similar experiment was conducted under the same condi¬ 
tions. The details of the experiment and the results secured are given 
in Table IV. 
As an additional precaution in securing seed which was known to be 
as free as possible from rust infection, all clean seed used was i year old. 
The infection which appeared in the fall may have originated from 
some infected Elymus glaucus plants which were later found not far 
from these plots. 
Tabi<^ III .—Development of rust on plants grown in the field at CorvalUst Oreg.t in igi 8 , 
from rusted and unrusted seed sown on Oct. 10, Jgij 
Na 
Variety. 
Condition of seed. 
Number 
rod 
rows. 
Date rust first 
appeared. 
I 
Chul. 
Badly rusted seed and chaff. 
28 
June 25,1918 
June 20,1918 
Do. 
June 22,1918 
June 25,1918 
Jtme 15,1918 
May 31,1918 
Jime 10,1918 
Do. 
2 
.do. 
Portions of infected heads. 
2 
.do. 
Treated with modified hot-water 
0 
8 
0 
4 
Talimka. 
treatment. 
Clean seed... 
2 
5 
Tigharia. 
Rusted kernels and chaff. 
2 
6 
Hansia Brooch. 
Rtisted kernels. 
0 
2 
7 
Popatia Nadiad.... 
.do. 
0 
2 
8 
Tones Winter Fife.. 
Chul. 
Clean seed. 
e 
Q 
0 
5 
y 
