Ink painting/drawing of cassava brown streak disease (left) and cassava mosaic disease (right).

I originally thought I had drawn two of the same virus, but was very politely corrected by one of my twitter followers!

The painting shows two leaves, each with seven leaf lobes. The leaves are a mosaic of yellow, light green and dark-green patches. The key symptomatic difference between these two viruses is the distorted leaf lamina (right).

Top: scanned image

Bottom: photograph