THE CONTROL, OF CABBAGE BLACK-LEG. 
11 
Table IV. — Effect of mercuric-chlorid solution upon the black-leg fungus within 
infected cabbage seeds and upon commercial seeds. 
Effect upon 
infected seeds. 
Effect upon 
commercial seeds 
73 
s 
C 
a 
o 
& 
X 
© 
o 
So 
§ 
© 
© 
X 
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^3 — © 
© ,«~ s- 
73 © 
73 ,Q "-' 
a 
ci 
73 . 
|f 
> £ 
% 
X — 
T- © 
©^ 
One-year-old seed. 
Two- 
year-old 
" seed. 
Method a of treatment and strength 
of the solution. 
Lot 
3-18.& 
- Lot 
4-19.c 
Lot 
5-19.d 
Lot 
2-18.& 
Lot 
2-18.& 
© 
_© 
X) 
© 
1 % 
©^ 
02 
oQ 
ci © 
C O 
is 
r 
s '5 
— if- 
©■~ 
X 
c © 
- © 
•r — 
©--' 
o 
X 
© ~— 
3 >. 
© .EL 
© 
« = 
n © 
3 5 
o 
=3 >> 
X 
4-18 
130 
24 
25 
25 
24 
25 
25 
25 
25 
10 
25 
10 
25 
39 
22 
24 
25 
25 
28 
13 
25 
25 
75.3 
22. 3 95-100 
n 
96 
ri 
92 
o 
92 
o 
80 
o 
Do 
1-19 
4.™ 
66.6 
! 
Method 1: 
]0 
56.0 
20.0 
16.6 
12.0 
12.0 
20.0 
4.0 

4.1 


is n 
99 
97 
99 
99 
99 
99 
98 
o 
c 
c 

e 
o 
o 
20 4-18 
30 4-18 
40 4-18 
60 4-18 
10 4-18 
20 4-18 
/ 20 1-19 
30 4-1S 
/ 30 1-19 
40 4-18 
60 4-18 
60 1-19 
120 4-18 
120 1-19 
180,4-18 
1S0|1-19 
304-18 
604-18 
601-19 
Strength 1 to 1,000 \ 
92 
o 
36. 01 8. 
20.0! 
...J- . 
12.0 
50.0 
12.0 
12.8 
63.6 

4.0 

28.5 
15.3 

8.0 
4.0 
20.0 
4.0 
2.5 
1.0 




"6"" 
8.0 
,... 98 
98 
93 
o 
"e 
e 
93 O 
94 
o 
8S 
o 
85 
o 
98 O 
90 
o 
81 
e 
82 
o 
85 
77 
e 
63 
e 
71 
e 
84 e 
70 
e 
57 
■*■ 
63 
. 
"*" 
Method 2: 
I 
87i e 
64] e 
72 
74 
e 
e 
Co 
ft 
1?0 
53 
e 
Method 3: 
10 
1 90 
81 
78 
74 
42 
13 
n 
o 
o 
+ 
Strength 1 to 500 \ 
30 
1-19 
24 
20.8 
8.3 
60 
120 
10 
30 
I 120 
++ 
Method 4: 
94 
n 
95 O 
95 O 
83 O 
51 ft 
Strength 1 to 500 < 
1-19 
S-50 
62.0: 2.0 
| 
! 
""{"" 
a Method l=not soaked previous to treatment, rinsed after treatment; method 2«=not soaked previous 
to treatment, not rinsed after treatment; method 3=soaked in water previous to treatment, rinsed 
after treatment; method 4= dipped in 70 per cent alcohol previous to treatment, rinsed after treatment. 
b Wisconsin Hollander variety grown at Racine Wis., in 1918. 
c All Seasons variety grown at La Conner, Wash., 1919. 
d Jersev Wakefield variety grown at La Conner, Wash., 1919. 
e Symbols used: 0=Noinjary; ©=slight; -H=medium; +=severe; ++= very severe. 
/ Disinfected by seed grower. 
g Dipped in 95 per cent instead of 70 per cent alcohol. 
With tlie second method of treatment (soaking in the disinfectant 
without rinsing in water), seedling injury occurred after a shorter 
period, evidently as a result of the prolonged action of the disinfectant. 
No advantage of this over the first method was found, however, 
since the action upon the fungus was no more rapid than upon the 
host. 
