444 
Journal of Agricultural Research 
voi. xxvn. No. 7 
they were first noted in the control row. This late appearance of in¬ 
fection in row i of Sonora was the same as in row i of Bunyip. 
In Pacific Bluestem the control row showed 33.3 per cent of smut, 
while rows 1, 2, and 3 showed 83.3, 43.7, and 42.8 per cent, respectively. 
Moreover, the total 83.3 per cent of smutted plants in row 1 appeared 
35 days before infection was first observed in the control row. 
Row 1 of Flint showed 54.5 per cent of the plants infected in compari¬ 
son with 41.2 per cent in the control and with 26.6 and 15.1 per cent in 
rows 2 and 3, respectively. The total 54.5 per cent of smutted plants 
in row 1 appeared 113 days before infection was first observed in the 
control row. 
o/?M/s A'tfA49£ye o/^^ys 
Fig. i.—G raph showing the time of appearance of Urocystis tritici and the percentage of infection on plants 
of Comeback wheat cut back at different stages of growth while growing in the greenhouse at Ross- 
lyn, Va., 1921-22. 
Fultz showed 40 and 77.7 per cent, respectively, in rows 1 and 2 in 
comparison with 18.8 per cent in the control row, and the final infections 
were noted in the first two rows more than 30 days before smut was first 
observed in the control row. Smut lesions appeared about the same time 
in rows 1 and 2, but did not appear in rows 3 and 4 until over 30 days 
after their first appearance in rows 1 and 2. 
4 n*In Jones Fife the son appeared about the same time in the first three 
rows and over 30 days before they appeared in the control row. Row 1 
had 21.3 per cent more smutted plants than the control row. Rows 2 and 
3 showed only slightly higher percentages of infection than the control, 
though the appearance of the disease was noted in each row more than 
30 days before it appeared in the control row. 
It is significant to note that in many cases infection can be produced 
earlier and in greater percentage by cutting back the plants. As pre¬ 
viously noted, the same effect was produced in Comeback by continued 
