Left: Sycamore Tar Spot from 26 Jul 2022

Right: Grapevine Red Blotch Virus from 03 Jul 2022

Admittedly these ended up on the same sheet out of convenience, but I really like the contrast of the five-lobed leaves.

Tar Spot: A picture of a simplified flat green leaf, with a black outline. There are black, tar-like spots on the surface, each surrounded by a thin outline of yellow chlorosis.

GRBV: A picture of a simplified flat green leaf, with a black outline and details picked out in red, painted on a white background.

Symptoms shown: red primary and secondary veins as well as red blotches in some interveinal zones.