Ink painting/drawing of Pierce’s disease of grape, caused by the bacterium Xylella fastidiosa.

The painting shows a single grapevine cane with two petioles, and two leaves. The ‘matchstick’ petioles have remained attached to the cane after their leaves have fallen. The margins of the two remaining leaves have dried out, with red colouration appearing between the dry areas and the green leaves. The wood of the cane has matured irregularly, with patches of green (‘green islands’) surrounded by brown.