The Bacterial Diseases of the Bean 43 



appearance to the ones commonly found in plants infected with Phyt. 

 phaseoli. Such spots may vary in size and become fairly large (figure 8). 

 They are not angular, and have no definite, wide, pale green zone although 

 they may be surrounded by a narrow yellowish border. These spots often 

 arise from infections of endogenous origin in systemically infected plants. 



Figure 9. leaf of a white marrow plant showing mottling due to phytomonas 

 medioaginis var. phaseolioola in the vascular system of the stem and the 

 petioles 



