Ink painting/drawing of two related diseases:

Top: early leaf spot of peanut, caused by the fungus Cercospora arachidicola.

Bottom: late lead spot of peanut, caused by the fungus Cercospora personata (synonym Phaeoisariopsis personata).

The painting shows both the adaxial (upper) and abaxial (lower) faces of a peanut leaf placed side-by-side. . Peanut leaves are compound, with four leaflets arranged in two pairs along the stem. Early leaf spot lesions appear as dark brown on the upper surface, surrounded by a yellowish-green halo, and a lighter brown on the lower surface.  In contrast, late leaf spot lesions appear as brown on the upper surface and black on the lower surface.

Top: scanned image

Bottom: photograph