THE PHILIPPINE 
JOURNAL OF SCIENCE 
VOL. 17 OCTOBER, 1920 No. 4 
ACTION OF SOME FUNGICIDES ON THE CITRUS- 
CANKER ORGANISM 
A PROGRESS REPORT 
By H. Atherton Lee 1 
Mycologist, Bureau of Science, Manila 
Experiments to determine the possibility of control by spray- 
ing methods of the bacterial disease, citrus canker, were under- 
taken by the writer in 1917. In developing this work it became 
desirable to understand more in detail the action of certain fungi- 
cides against Pseudomonas citri Hasse, the cause of the disease. 
Experiments were therefore undertaken to determine the toxic 
action of the common fungicides by the methods proposed by 
Anderson and McClintic 2 for obtaining the phenol coefficient of 
disinfectants. 
A paper by Jehle 3 has already presented experiments upon 
the action of disinfectants on Pseudomonas citri. Jehle’s tests 
were made by means of Hill’s method, the glass-rod method, the 
platinum-loop method, and the filter-paper method. His work 
1 Appreciation is hereby expressed to Dr. O. Schobl, bacteriologist in 
charge of the serum division, and to Mr. A. H. Wells, chief of the divi- , ^ 
sion of organic chemistry of the Bureau of Science, for many helpful 
suggestions. Thanks are also due to Mr. Mariano G. Medalla, assistant 
pathologist of the Bureau of Agriculture, for loyal assistance throughout 
the experiments. 
3 Anderson, John F., and McClintic, Thomas B., Method of standardizing 
disinfectants with and without organic matter, Bull. Hyg. Lab. 82 (1912). 
3 Jehle, R. A., Effect of disinfectants upon Bacterium citri, Quarterly 
Bull. States Plant Board Florida, No. 2, 2 (January, 1918) 112. 
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