PLATE i 
Bacterial leafspot of red clover. 
Blighted leaves of red clover (Trifolium pratense) from Madison, Wis., showing 
natural infection in various stages of development, collected by M. M. Williamson at 
Madison, Wis. Young lesions are characteristically distributed in the upper leaflets 
of branch A as well as in those of leaf B, while older lesions appear in the lower leaf 
of branch A and in leaf C. Note the uniform black color of the young lesions as con¬ 
trasted with those in leaf C, in which the centers are dried out and lighter in color 
(cf. PI. 2). The splitting of the dead areas following the drying out of marginal lesions, 
which causes a ragged appearance of the leaves, is well shown in the lower leaves of 
branch A and in leaf C. 
