PLATE IX 



Fig. I. — View of lower side of leaves of seedling grapefruit artificially inoculated 

 with Pseudomonas citri. 



Fig. 2. — Top view of plant shown in figiu-e i. 



Fig. 3. — Spongy white cankers on leaf and twig of seedling grapefruit produced by 

 artificial inoculation. The plants were continuously kept under a bell jar in a humid 

 atmosphere. 



Fig. 4. — Citrus canker on Satsuma leaves resulting from artificial inoculation with 

 Pseudomonas citri. 



Fig. 5. — Photomicrograph of section of yoimg, open canker on grapefruit. 



