12 
BULLETIN 629, U. S. DEPARTMENT OF AGRICULTURE, 
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. 
© 
GO 
3 
o 
1 
© 
© 
a 
o 
c3 
GO 
© 
.2 
© bO 
© 
P-' 
CO 
co 
<i 
c 
50 
© 
© 
CO 
T3 
2© 
03 +3 
c s 
so' 
C 
•3 
© 
© 
CO 
a 
2© 
~5 
00 ,.„ 
PI Q 
Remarks. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10- 
A vena sterilis and varie- 
ties—Continued. 
Burt 
76 
81 
696 
39 R ? 
41 R." 
'SR.f + S) 
45 R.? 
47 S.? 
49 g"? 
s'.' 
s. 
s. 
52 R. 
S. 
54 S.? 
56 R.? 
58 S.? 
S. 
s. 
60 R.? 
40 R. 
42 R.? 
44 R. 
46 R. 
48 R. 
50 R.? 
S. 
S. 
S. 
53 R 
g 
s! 
57 R. 
s. 
s. 
s. 
61 R. 
S. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
s. 
g 
s. 
s. 
s. 
s. 
s. 
51 S.? « 
s. * 
s. 
s. 
55R. + S. 
s. 
s. 
59 R.? 
s. 
s. 
Do 
710 
Early Ripe 
Cook 
697 
694 
Fulghum 
73 
Golden Rustproof 
61 
93 
54 
57 
58 
"1796 
509 
Do 
Italian Rustproof 
388 
397 
409-4 
Do 
Italian Rustproof selec- 
tion. 
Red Rustproof 
24 
52 
62 
78 
59 
53 
67 
309 
Red Rustproof selection 
261-7 
Do 
518-15 
700 
487 
Do 
Turkish Rustproof se- 
356-19 
627 

lection. 
Do 

3 9 Three series of inoculations were made. In each some leaves were rather heavily rusted, others lightly, 
and on some no uredinia (only flecks) were formed. Telia were freely produced on leaves where no normal 
uredinia had previously ruptured the epidermis. 
40 Normal uredinia on one leaf; flecks only on the other. 
41 In the three series of inoculations made'no leaf was heavily rusted. Only a few had even a slight infec- 
tion, while most of them very quickly showed large reddish brown blotches of dead tissue and smaller 
yellowish green flecks and no uredinia (see PI. III). 
42 Normal infection at the base of each leaf, the upper portion heavily flecked and soon turning brown 
in color, with no normal uredinia. 
43 In the seven series inoculated, there were both susceptible and resistant plants, the former with many 
normal uredinia, the latter with few and small uredinia or flecks only. On many leaves, large blotches of 
host tissue were killed soon after inoculation. On some of these, telia were later developed. 
44 Of five leaves inoculated, on only one were normal uredinia produced and these only at the base. On 
one leaf a few tiny uredinia were formed, and on three flecks only appeared. 
45 In the first series of 6 leaves inoculated, a few light -green flecks furnished the only evidences of infec- 
tion. In two later series of 6 and 10 leaves inoculated, normal infections occurred on 8 of the 16, while the 
other 8 had only small uredinia or flecks. 
46 No uredinia appeared in three weeks after inoculation; then only tiny ones on one leaf. Distinct 
flecks were evident. 
47 Of 9 leaves in the first series inoculated, 1 was heavily rusted, 6 medium, and on 2 only flecks appeared. 
Of 14 leaves in a second series, fairly normal infection occurred on all, though some uredinia were rather 
small. No sharp indications of resistance. 
48 Two leaves inoculated; on neither were any normal uredinia produced. Uredinia small and accom- 
panied by flecks. 
« In the first series of 8 leaves, normal infection occurred on 5, light on 2, flecks only on 1. In the 
second series of 9 leaves, 4 were heavily rusted and 5 lightly. 
50 No uredinia in 11 days after inoculation, then only 1 or 2 small ones on each leaf. There were also 
blotches of dead host tissue. 
5i No uredinia normal in size or vigor: after 21 days they were still small. 
5 2 Of 6 inoculated leaves in the first series, normal infection was produced on 3 and very small uredinia 
and flecks on 3. No normal injection occurred on 9 leaves inoculated in the second series. There were 
only a few tiny uredinia with many flecks. 
53 No signs of infection except dead leaf tips. 
54 In the first series of 9 leaves inoculated, normal infection was secured on 6, while only flecks ap- 
peared on 3 in the time characteristic for uredinia. Telia were formed later. In the second series, the 
2 leaves inoculated were rusted heavily. 
55 Normal (very heavy) infection on one culm; onlv a very few small uredinia on the other. 
56 No evidences of infection on the leaves of the first series inoculated. Only a few tiny uredinia were 
formed on the 9 leaves in the second series inoculated. 
57 Only a few very small uredinia; many flecks. 
ss Of 10 leaves in the first series inoculated, 6 were heavily rusted and a light infection on 4. Of 11 leaves 
in the second series, 6 were heavily rusted, on 4 only a few very small uredinia developed, and on 1 only 
flecks appeared in the time usual for uredinia formation. An abundance of telia later occurred. 
59 No uredinia of normal size and vigor; only a few tiny ones on each leaf. 
« Of the first series of five leaves inoculated, one was very heavily rusted, three had only a light infec- 
tion, and on one only flecks were produced. All leaves of the second series inoculated were rather 
heavily rusted, but numerous flecks were observed, also indicating some degree of resistance. 
6i Infection not heavy; uredinia on each leaf few and small. 
