TREATMENTS OE SEED WHEAT FOR LOOSE SMUT 
appeared weak and spindling, and the initial setback unquestionably 
was greater than indicated by the reduction in the number which 
survived. In order to show the effects of the various treatments on 
emergence, three lots of Goens wheat (Nos. 18, 20, and 22) grown in 
1921 were treated on September 7 and 8, 1921, at the temperatures 
and during the time periods specified in Table 4. The seed then 
was spread to cool, left to dry at room temperature for one week, and 
packeted. On December 3, 1921, 50 untreated kernels of each of 
the three lots and 50 kernels from each treatment of each lot were 
sown in soil in greenhouse flats. Following the date of emergence of 
the first seedling, daily records of the number of seedlings which had 
emerged were taken for 15 days. 
Table 4. — Total number of seedlings of three lots of Goens wheat which had emerged 
at the end of the fifth to the nineteenth day after sowing, with final -percentages 
of emergence, from 150 seeds untreated or treated with hot water, as specified, and 
sown in soil in the greenhouse December 3, 1921 
Treatment of the seed 
Total seedlings emerged on 
the following number of days after 
sowme 
Final 
emer- 
Duration 
gence 
Kind and 
temperature 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
(per 
Hours 
Min- 
utes 
cent) 
1 

02 
2 
120 
1? 
126 
25 
130 
46 
130 
55 
131 
62 
132 
69 
132 
71 
132 
74 
132 
78 
132 
79 
132 
80 
132 
80 
132 
80 
88.0 
Modified method 
53.3 
Single-bath method: 
{ 2 
30 
4 
53104 
108 
116 
116 
118 
118 
119 
120 
121 
121 
121 
121 
121 
80.7 
At46° C 
3 
3 
48 1 95 
109 
115 
115 
116 
119 
120 
121 
122 
123 
123 
123 
123 
82.0 
1 3 
30 
5 
38 91 
101 
112 
113 
118 
120 
120 
120 
121 
121 
121 
121 
121 
80.7 
I 4 
3 
29, 85 
98 
104 
107 
113 
115 
117 
118 
118 
119 
119 
119 
119 
79.3 
f 2 
6 
45' 96 
101 
111 
113 
114 
118 
118 
119 
120 
12C 
120 
120 
120 
80.0 
2 
15 
1 
271 94 
104 
107 
107 
111 
114 
117 
117 
117 
117 
118 
11* 
118 
78.7 
At 47° C 
\ 2 
30 
2 
18j 66 
91 
102 
105 
109 
113 
113 
115 
116 
116 
116 
116 
116 
77.3 
2 
45 
1 
24 70 
86 
91 
95 
98 
100 
100 
103 
105 
105 
105 
105 
105 
70.0 
I 3 
3 
111 31 
59 
87 
89 
92 
96 
97 
98 
99 
100 
100 
100 
100 
66.7 
1 
40 
4 
38 82 
99 
107 
110 
114 
115 
115 
116 
117 
117 
117 
117 
117 
78.0 
At 48° C. 
{ 1 
50 
1 
19 80 
93 
103 
106 
108 
111 
111 
113 
114 
114 
114 
11-1 
m 
76.0 
I 2 

10 ( 77 
92 
102 
104 
107 
109 
110 
111 
112 
112 
112 
112 
112 
74.7 
At49°C , 
1 
35 
14 
36 84 
98 
105 
107 
108 
112 
113 
114 
117 
117 
117 
117 
117 
78.0 
At50°C 
1 
15 
1 
6 35 
56 
63 
69 
70 
72 
72 
74 
75 
75 
75 
75 
75 
50.0 
At51°C 
1 

6 32 
50 
63 
70 
70 
75 
76 
78 
79 
80 
I 81 
81 
81 
54.0 
Table 4 shows that, in general, with increases in the severity of 
treatment as expressed by reduction in final percentage of emergence, 
the degree of retardation in the emergence of surviving seedlings also 
increased. Figure 1 shows this graphically for some of the treat- 
ments employed. 
As shown later, the treatment at 48° C. for 1 hour and 50 minutes 
proved to be one of the most satisfactory for the single-bath method. 
The emergence and growth of seedlings from three varieties of ma- 
chine-threshed wheat to which this treatment was applied, in com- 
parison with that of seedlings from wheat treated by the modified 
method and from untreated wheat, are shown in Figure 2. The 
varieties, Currell (C. I. 3326), Purplestraw (C. I. 1915), and Goens, 
were grown on the Arlington Experiment Farm, Rosslyn, Va., in 1921. 
The seed was treated on July 11, 1921, spread out, and left to dry at 
room temperature until August 8. At this time 200 untreated seeds 
of each lot and 200 seeds from each of the treatments of each lot were 
sown in soil in flats in the greenhouse. Two weeks later some of the 
