Bui. 1288, U. S. Dept. of Agriculture 
Plate I 
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Leaf-Spot on Tomato and Other Hosts. — I 
A, Leaf-spot of tomato (Septoria lycopcrsici Spec.); spots natural size. B, Part of tomato leaf 
enlarged to show pyenidia, or spore pustules (small black bodies), on light-gray spots. C, 
A single spot of the leaf shown in B considerably enlarged; ostioles appear as small white 
openings in center of pyenidia. D, Flower and leaf of horsenettle (Solarium cnrolin, - i. 
E, Seed balls of horsenettle. F and G, Leaf-spot of horsenettle produced by inoculation 
with a pure culture of Septoria lycopcrsici from tomato. H, Part of horsenettle leaf enlarged 
to show pyenidia of Septoria lycopcrsici 
