TREATMENTS OF SEED WHEAT FOR LOOSE SMUT 
11 
An experiment also was conducted in 1921-22 to determine 
the effects of the single-bath hot-water treatments on yield and 
further to determine their effects on the control of loose smut. Three 
lots of Goens wheat (Nos. 16, 17, and 19) and one lot each of Fulcaster 
(C. I. 6162) and Purplestraw (C. I. 1915) wheats were used. The 
Goens lots were grown in Indiana in 1921 and contained relatively 
high percentages of loose smut. The other lots were grown on 
Arlington Experiment Farm in 1921 but contained no loose smut. 
A definite quantity of each lot was weighed and measured, treated 
on October 13, 1921, spread in thin layers, and dried for one week at 
room temperature. The treated seed had regained its original weight 
and volume at the end of this period. 
On October 21 the untreated and treated seed was sown in rod rows 
on Arlington Experiment Farm at the rate of 6 pecks per acre. Five 
plats were used, and each plat was divided into an east and west 
section. Each of these 10 sections contained 55 rows, which com- 
prised 11 successive rows of each of the lots 16, 17, 19, 26, and 27 in 
their order. The first 9 of the 11 rows were sown with seed treated 
by the single-bath method in the manner and order shown in Table 6, 
while the tenth and eleventh rows were sown with seed treated by the 
modified method and with untreated seed, respectively. The 
untreated control and each of the treatments were therefore repre- 
sented by 10 rod rows of each of 5 different lots of seed, or a total of 50 
rod rows. The results are presented in Table 6. A zero in the 
columns containing the average percentages of loose smut shows that 
no smut was found in a complete examination of each of the 10 rows 
sown from the seed treated as specified. When less than 1 per cent of 
smut was present it is shown by T (trace), and the total number of 
smutted heads found in an examination of all 10 rows appears in 
parentheses. Other data represent the average percentages of smut 
determined by making a count of 100 heads in each of the 10 rows. 
Table 6. — Loose-smut infection and yields of wheat from five loi<< of seed untreated 
or treated with hot water, as specified, and sown on an east and on a west section of 
each of five plats in the field at Arlington Experiment Farm October 21, 1921 
[T= 
: trace (less than 1 per cent). The figures in parentheses show the number of smutted heads found in 
all 10 of the rod rows] 
Treatment of the seed 
Kind and tempera- 
ture 
Untreated 
Modified method. .. 
Single-bath method 
At 47° C 
At 48° C 
At 49° C 
Dura- 
tion 
Average acre yields (bushels) 
On east sections of 
plats 
Lot 
35.5 
27.2 
25.8 
29. 8 
Lot Lot! Lot 
17 19 : 
34. 5 31. 
21. 1 23. 
28. 9 27. 
31.7 31. 
15 
30 30.8 33.8 31 
45 30. 9 30. 30. 
...|29.5l30.930. 
40 33 4 33. 3 33. 
50 31. 7133.2 31. 
...33.6 31. 1|29. 
35 33.3 31.5 32. 
7 26. 
8 21. 
9 28. 
6 27. 
6 25. 
2 24. 
1 26. 
27. 
7 27. 
ti 28. 
9 28. 
33. 
-N. 
28. 
28. 
8 26. 
1 28. 
7 27. 
1 27. 
9 20. 
33.0 
23.9 
29.0 
29.8 
6 30.1 
3 28. 9 
2 28. 7 
5 3L 1 
7 30.4 
4 30.0 
6 31.2 
On west sections of 
plats 
36.5 
30.5 
32.3 
32.3 
34. 2 34. 
33. 1 32. 
31.3 34. 
32. 1 34. 
37. 38. 
35. 4 36. 
34. 3 36. 
35. 8 39. 
Lot 
19 
Lot 
Av- 
30. 7 31 
27. 8 30. 
34. 1 31. 
7 36. 7 29. 
9 34.2 31. 
5 34. 8 32. 
5 31.7 29. 
2 33. 9 32. 
1!34. 2 28. 
1 34. 4 30. 
5 36 5 33. 
.6 34. 
3 31. 
4 32. 
7 33. 
131. 
731. 
5 33. 
2 35. 
35. 
31. 
6 33. 
7 34.3 
2 29.2 
1 32. 1 
2 33. 7 
2 32. 5 
5 33. 
9 32. 3 
4 35. 3 
4 33. 8 
3 33. 2 
5 35. B 
26.6 
30.7 
Average per 
centage of 
loose smut i 
Lot 
Lot 
16 
17 
7.2 
9.0 



T (6) 

T(l) 







T(3) 






Lot 
19 
13.0 

T(5) 








1 Lots 26 and 27 contained no loose smut. 
