I'l.ATi: I. 



Fi{^. 1. (jIius canker on bir.nclu's of i»rai)ofruit. 



Fig. 2. Cilriis trifoliala twigs an'ccted witli citrus cankci'. 



Fig. 'A. Infection through wounds made by thorn scratches 

 on seedling grapefruit leaves. 



