17,4 Lee: Fungicides and the Citrus-canker Organism 329 
fore, 1 to 300 seems to be the most dilute solution possible for 
this disinfectant. 
Table 3. — Results of exposures with 3-day-old culture of Pseudomonas 
citri in dilutions of Liquor cresolis compositus. 
Dilution. 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
Exposure. 
400. 
300. 
200. 
100. 
600. 
500. 
400. 
300. 
200. 
Tested, February 7, 
1920; observed, Feb- 
ruary 10, 1920. 
Tested, April 28, 1920; ob- 
served, April 30, 1920. 
Min. sec. 
2 30 
+ 
— 
— 
— 
+ 
+ 
— 
- 
5 00 
— 
— 
— 
— 
+ 
+ 
— 
— 
— 
7 30 
— 
— 
— 
— 
+ 
— 
— 
— 
— 
10 00 
- 
- 
— 
— 
+ 
— 
— 
— 
— 
12 30 
15 00 
The kerosene emulsion, the tests of which are reported in 
Table 4, is a mixture suggested by previous experience for 
possible use as a disinfectant in canker-control work, also operat- 
ing as a contact insecticide against scale insects which often 
become serious on citrus trees following copper sprays. The 
stock emulsion was prepared by adding 3 parts of kerosene to 1 
of Liquor cresolis compositus. In a 1 to 50 mixture of this stock 
solution with water, the Liquor cresolis compositus would then 
be at a dilution of 1 to 200 parts of water. 
Table 4. — Results of exposures with 3-day-old culture of Pseudomonas 
citri in dilutions of kerosene stock emulsion. 
[Date of test, February 5, 1920 ; date of observation, February 8, 1920.] 
Dilution. 
Exposure. 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
1 to 
90. 
85. 
80. 
75. 
70. 
65. 
60. 
55. 
50. 
45. 
Min. sec. 
2 30 
+ 
+ 
+ 
+ 
+ 
+ 
a-L 
- 
— 
b— 
5 00 
+ 
+ 
+ 
+ 
+ 
— 
— 
C 
— 
— 
7 30 
10 00 
12 30 
15 00 
+ 
_1_ 
+ 
b— 
n Tube tested for P. citri, February 7 ; positive for P. citri, February 8. 
b Tube tested for P. citri, February 7 ; negative for P. citri, February 8. 
c Tube tested for P. citri, February 8 ; negative for P. citri, February 11. 
