RUST RESISTANCE OF OAT VARIETIES. 
11 
Table I. — Summary of notes on the rust resistance of oat varieties tested in the 
greenhouse at Cornell University, Ithaca, N. Y., 1915-16 — Continued. 
[R.= resistant; S.= susceptible.] 
Identification numbers. 
Crown rust. 
Stem rust. 
Variety. 
m 
O 
■a 
CD 
o 
o 
w 
o 
it 
O 
CO 
CO 
< 
g 
§0 
CO 
c3 
Sa 
B 
CO 
*6 
is ® 
s a 
Remarks. 
1 
2 
3 
4 
5 
ft 
7 
8 
9 
10 
Avena sativa (botanical 
races)— Continued. 
294 
297 
298 
299 
301 
302 
303 
119 
112 
295 
109 
111 
114 
118 
126 
268 
269 
270 
271 
272 
273 
121 
116 
24 R.? 
S. 
S. 
S. 
S. 
S. 
S. 
27 S.? 
S. 
29 S.? 
25 R.? 
s. 
s. 
s. 
s. 
s. 
26 R.? 
23R.? + S. 
s. 
30 R ? 
s!' 
s. 
s. 
s. 
s. 
s. 
s. 
S. 
S. 
S. 
33 R.? 
S. 
35 S.? 
s. 
s. 
R. 
38 R. 
S. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
"s." 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
31 R.? 
s. 
s. 
s. 
32 R ? 
s." 
s. 
34 R.? 
s. 
s. 
s. 
s. 
s. 
I 
I 
Do 
Do .. 
Miscellaneous species of 
Avena: 
95354 
Do... 
Do. 
S. 
S. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s! 
s. 
s. 
36 R ? 
37 S.? 
L 
25351 
16894 
Do. . 
Do. 
A. orientalis pugnax 
25357 
91751 
Do. 
Avena sterilis and varieties: 
Avena sterilis 
543 
Do .... 
296 
47 
74 
48 
Algerian Red. ..... 
i 
...... 
695 
Burt 
24 In the first series inoculated, small uredinia on two out of nine leaves, flecks only on seven. All leaves 
soon dry and dead. In the second series inoculated, heavy infection occurred on five and light infection 
on five. 
25 Flecks only 10 days after inoculation; later a few tiny uredinia, accompanied and surrounded by 
many flecks. 
26 No uredinia 10 days after inoculation; later a few tiny ones on each leaf, surrounded by flecked areas 
of host tissue. 
27 In the first series fairly heavy infections were obtained on all leaves inoculated, but uredinia were 
small. In the second series normal infection on two leaves, medium on eight, and light on two. 
28 Heavy infection on only one leaf; only a few tiny uredinia on the other two. 
2 9 In the first series of inoculations fairly vigorous infections were obtained on some of the leaves. On 
other leaves only a few small uredinia appeared, the leaf soon drying and turning brown. In a second 
series, normal infection occurred on all leaves inoculated. 
3 Flecks only 10 days after inoculation. A few small uredinia appeared later, accompanied by distinct 
flecks. 
si On one plant, uredinia nearly normal in size, but accompanied by purple blotches; no uredinia were 
produced on the other plant. 
32 Uredinia few and small; infection not heavy. 
33 No evidence of infection in 10 days after inoculation; the few uredinia finally produced were small. 
34 Uredinia normal on one plant; on the other small and surrounded by purple blotches. 
35 Flecks only on one of the two leaves inoculated. The leaf soon dried up. A large number of normal 
urodinia appeared on the tip of the other leaf. On most of the leaf surface, however, there were very few 
uredinia but many flecks. 
36 Of the first series of 11 leaves inoculated 5 were heavily infected, while on 6 only flecks were evident. 
In the second series inoculated uredinia were produced on all leaves but were accompanied by many yel- 
lowish flecks, and larger blotches of dead host tissue surrounded each uredinium. 
37 In the first series of leaves inoculated 6 out of 10 leaves were rather heavily rusted, 1 showed light infec- 
tion, and on 3 only flecks appeared. In the second series nearly normal infections were secured on all 
the 8 leaves inoculated. In the third series medium to good infection resulted on all 11 leaves inocu- 
lated. Many of the uredinia were of normal size, but surrounded by light yellowish green flecks. 
38 No uredinia. Rather indistinct light-green flecks were observed, indicative of the presence of rust 
hyphae. 
