Sept, i, 1923 
Puccinia glumarum and Hosts for Variety tritici 
397 
NURSERY AND GREENHOUSE RESULTS COMPARED 
Table IX presents a comparison of the results obtained in both the 
nursery and greenhouse with certain varieties which have proved very 
resistant in all these trials. No varieties are listed unless they were 
grown three seasons in the nursery and tested for resistance there. 
Table IX .—Data showing summarized results of nursery and greenhouse experiments on 
susceptibility of wheat varieties to infection by P. glumarum tritici 
Variety. 
1 Nursery. 
i 
Greenhouse. 
C. I. No. 
Number 
of experi¬ 
ments. 
Average 
suscepti¬ 
bility. 
Number 
of experi¬ 
ments. 
Character 
of infec¬ 
tion. 
Barletta. 
3297 
4 
0. 5 
3 
O 
Dicklow. 
4758 
8 
12 
5 
O 
Foisy. 
5253 
6 
17 
2 
2 
Einkom. 
2433 
4 
O 
1 
O 
Fultz. 
3416 
5 
14 
1 
O 
Harvest Queen.! 
i 5314 
4 
I 
2 
0 
Haynes Bluestem. 
2874 
6 
33 
3 
1-2 
Kharkof. 
2193 
5 
10 
3 
2-3 
Kinney. 
5197 
6 
Trace. 
1 
O 
Preston. 
3081 
10 
15 
4 
O 
Wilhelmina. 
4193 
6 
6 
4 
O 
Early Red Fife. 
4932 
6 
22 
3 
O 
Red Russian. 
45°9 
6 
4 
2 
O 
Red Winter spelt. 
1772 
5 
0 
1 
I 
Rink. 
$868 
6 
Trace. 
s 
2 
Royal ton. 
4968 
6 
0 
1 
I 
Sonora. 
3036 
6 
4 
10 
I 
Challenge (Webbs Challenge 
White). 
4683 
6 
Trace. 
White Winter. 
4684 
6 
Trace. 
1 
O 
As shown by Tables III to IX, there has been a marked difference in 
susceptibility to stripe rust in the different varieties of wheat. Further 
study doubtless will show whether there are strains of the rust which are 
able to attack some of these varieties which have proved resistant to the 
strains which have been under observation. The difference in suscepti¬ 
bility to stripe rust in the various varieties of wheat which have been 
studied seems to be much more marked than in the case of either stem 
rust or leaf rust. 
Various European workers have referred to this very marked difference 
in susceptibility to P. glumarum as it appears in Europe. Henning ( 8 ) 
states in this connection, “The economic importance of the yellow rust 
has recently, in our country (Sweden), been considered rather inferior, 
since we, in the latter part of the nineteenth century, have demonstrated 
that the different varieties of wheat show a very unlike susceptibility to 
this disease; moreover, we have succeeded in producing varieties, by 
means of crossing, which possess a marked power of resistance toward 
yellow rust. However, we have learned recently that this power of 
resistance is quite variable, so that we must give some further attention 
to this kind of rust.” 
