60 



BACTERIAL DISEASES OF PLANTS 



M 



Fig. 42. — Citrus canker on leaf of seedling grape-fruit. Inoculated by the 

 writer with Bacterium citri (Hasse) Jehle, isolated from a grape-fruit leaf received 

 from Mississippi in 1915. Time, 16 days. Cankers not yet ruptured. X 5. 



