wal 
wal 
to both loose and covered smut, and Monarch, resistant to the 
oose smut, but susceptible to the covered. ‘There were 287 second 
generation plants inoculated with the loose smut, and 113 (39.3 
per cent.) were infected. These results clearly indicate that seg- 
regation for resistance to the loose smut occurs in the second gen- 
eration. In the corresponding series with the covered smut, 90 
plants were inoculated, and 89 (98.8 per cent.) were infected; thus 
the second generation plants were as susceptible to covered smut 
as the two parental varieties. 
Hybrid 80, Canadian Monarch Selection, affords an interest- 
ing contrast to Hybrid 79. Both parental varieties are susceptible 
to the loose smut, while Monarch Selection is resistant to the cov- 
— 
ered smut. There were 97 second generation plants inoculated 
with the covered smut and 28 (28.8 per cent.) were infected. 
Segregation for resistance to the covered smut is indicated. There 
were 49 second generation plants inoculated with the loose smut, 
and 48 (97.9 per cent.) were infected; thus the second generation 
plants were as susceptible to the loose smut as the two parental 
varieties. 
Hybrid 81, Gothland & Black Mesdag, is a cross between two 
varieties which are resistant to covered smut, while Gothland is 
susceptible to the loose smut. There were 97 plants inoculated 
with the loose smut and 26 (26.8 per cent.) were infected, a result 
usually obtained in the second generation when a susceptible va- 
riety 1s crossed with a resistant. In the series with the covered 
smut, there were 47 plants inoculated, and none were infected, thus 
corresponding in their behavior to the two parental varieties. 
Hybrid 82, Danish Island & Monarch, was represented by five 
crosses. Danish Island is very susceptible to the loose smut and 
resistant to the covered smut, although occasionally a few plants 
are infected. Monarch, on the other hand, is very resistant to the 
loose smut and susceptible to the covered. There were 293 second 
generation plants inoculated with the loose smut and 57 (19.4 per 
cent.) were infected. In the series with the covered smut there 
were 287 plants inoculated, and 205 (71.4 per cent.) infected. 
The results with Hybrids 79, 81, and 82, with the loose smut, 
suggest a characteristic segregation on the basis of a ratio of three 
resistant plants to one susceptible. The percentage of infection 
