PLATE i 
A. —Leaf of Havana Seed tobacco, showing fairly typical symptoms of the Wisconsin 
leafspot (“rust”) disease. Natural infection. 
B. —More detailed view of portion of leaf similar to that illustrated in A, showing 
the central points of infection, the coalescence of the spots, and their relation to the 
veins. 
C. —A leaf showing a fairly typical case of “wildfire 0 on Havana Seed tobacco. 
Compare with Wisconsin leafspot. This leaf was collected in Connecticut in July, 
1919, and was the first authentic case of the wildfire disease in New England. 
(494) 
