PLANT BACTERIA, VOL. 2. 



PLATE 2. 



Black Rot of Crucifers. 



Cabbage-leaf (plant 402) . showing three marginal infections which began in groups of water-pores as the result of spraying Bacterium 

 campestre upon the plant. The spraying was made Dec. 9, 1904. and the photograph at the end of two months (Feb. 6). 



