BULLETIN 1029, U. S. DEPARTMENT OF AGRICULTURE. 
jury to the seed was caused at 96 hours ; therefore this method gave 
some promise as a practical means of control. When it was extended 
to other seed lots, however, the deleterious effects of the treatment 
became evident at a much shorter exposure. This was most notice- 
able in the case of No. 2-18 seed when treated in the second year. 
Table I. 
-Effect of desiccation and heat upon commercial cabbage seeds and 
upon the black-leg fungus ivithin infected seeds. 
Effect upon in- 
fected seeds. 
Effect upon commercial seeds. 
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Lot 2- 
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Untreated: 
4-18 
1-19 
130 
24 
75.3 
66.6 
22.3 

Exposed at constant tem- 
perature: 
At 85° a— 
6.38 
97 
O 
6.9 
3.17 
2.97 
1.69 
1.51 
1.42 
1.22 
92 
77 
64 
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2.25 
2.12 
1.85 
1.85 
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4-18 
4-18 
4-18 
4-18 
4-18 
4-18 
4-18 
4-18 
22 40.9 
49:32.6 
4517. 7 
49120.4 
46 4.3 
25 36. 

6.1 
8.8 


16.0 
2.2 

1.27 
1.27 
1.02 
.85 
.85 
.72 
.93 
.78 
95 
97 
95 
95 
96 
95 
96 
87 
8 
8 
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94 
88 
85 
90 
84 
74 
55 
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12 hours 
24 hours 
30 hours 
87 
88 
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+ 
+ 
1.29 
1.15 
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1.22 
1.10 
63 
42 
31 
25 
17 
+ 
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1 9? 
32 
22 
13 
14 
12 
+ 
71 
58 
17 
+ 
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h- 1.32 
-f- 1.63 
+ 
44 
49 
9.0 

+ 
+ 
120 hours 
1.60 
+ 
At 90° a— 
4-18 
4-18 
4-18 
4-18 
4-18 
4-18 
24 
25 
24 
48 
24 
47 
25.0 
4.0 
4.1 
4.1 








93 
63 
57 
10 
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e 
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70 
77 
70 
16 
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o 
78 
29 
30 

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2.06 
1.40 
1.02 
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3 
86 
80 
85 
88 
87 
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38 
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3 
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At 95° a— 
.... 
46 
58 
55 
56 
53 
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+ 
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10 
1 
5 
2 
1 
-f-f 
2.09 
1.85 
1 74 
++ 
4 hours 
++ 
T+ 
12 hours 
4-18 
4-18 
4-18 
4-18 
35 
23 
24 
20 
2.8 







34 
+ 
66 
33 
9 

+ 
+ 
1.85 
T+ 
24 hours 
.48 
.36 
.25 
.31 
.27 
1.31 
77 
21 



90 
22 


e 
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21 
35 
15 

+ 
+ 
+ 
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8 
2 
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1.76 
1 75 
2 
1 


++ 
++ 
48 hours 
1.63 
1.74 
++ 
72 hours 
++ 
Dried at 37° to 50° C 5 days, 
at 73° 3 days, then at 
100° C: 
hour 
o 
+ 
12 hours 
| 
24 hours 
36 hours 
1 
....! 
1 
a Wisconsin Hollander variety grown at Racine, Wis., in 1918. 
6 All Seasons variety grown at La Conner, Wash., in 1919. 
c Wisconsin All Seasons variety grown at Racine, Wis., in 191S. 
d Symbols used: 0= No injury; ©= slight; -^=medium; +=severe; ++= very severe. 
