17, 6 
Lee: Black Spot of Citrus Fruits 
641 
The fungus was reisolated in culture from the positive inocula- 
tions. Inoculations have since been made a number of times 
resulting positively in reasonable percentages of cases, indicating 
that Phoma citricarpa is the cause of the black-spot lesions. 
Phoma citricarpa is briefly described from cultures. 
3. The sweet orange and mandarin orange fruits were ob- 
served to be affected in China. McAlpine also reports lemons 
to be affected. Other citrus species have not been observed to 
be affected. The activity of the disease is not limited by the low 
temperatures of the northernmost citrus-growing regions. 
4. Although the disease is not serious and moreover could 
probably be prevented by spraying methods, it is desirable, in 
order to avoid the cost of spraying methods, to exclude it entirely 
from such citrus-growing countries in which it has not yet 
appeared. The present paper calls attention to the desirability 
of exclusion for such countries as Japan, California, and Florida. 
