PLATE 2 
A. —Leaves from tobacco seedlings in seed beds, showing typical lesions. Such 
leaves readily carry the infestation to the fields. Note the halo surrounding the 
points of infection (B, C, and D). Artificial inoculation with leafspot organisms by 
means of pin pricks on tobacco leaves, illustrating their similarity under certain 
conditions (B, C, D, and E). 
B. —Leaf inoculated with Wisconsin leafspot organism. 
C. —Leaf inoculated with wildfire organisms. 
D. —Leaf inoculated with Wisconsin leafspot organism with lowered virulence. 
E. —Control, pricked, but not inoculated. 
