Diseases of Potatoes. 
169 
potatoes should be carefully selected, and all showing the 
slightest symptom of injury should be separated. 
Turnips and swedes were submitted which were suffering 
from finger-and-toe. This has been figured and described in 
the Journal. 1 The bacterial disease described in the Report for 
1903 was again met with and reported upon. Turnips were sent 
from Norfolk, which, when* cut, showed streaks of a yellowish 
colour in striking contrast to the white flesh of the turnip. 
Fig. 2.— A, Acid rot bacteria ( Bacillus solaniperda Mig.). B, Black leg or potato stem 
rot bacteria ( Bacillus phytophthorus Appel). C, Bacteria causing disease in mangels. 
D, Bacteria causing disease in tomatoes. 
These four figures of bacteria are produced by photo-micrography, and are all 
magnified 500 times. 
This was found to be due to the food stored in the cells, which 
was in the form of sugar and not of starch, a phenomenon 
not infrequent in the carrot. 
From Cornwall were received some mangels which began 
to fail in September, the leaves withering and the roots failing 
1 Journal R.A.S.E., Yol. 54, 1893, pp. 334-339. 
