Oval-shaped, brown spots with a yellow border on infected leaves

Oval-shaped, brown spots with a yellow border on infected leaves

Close-up of oval-shaped, brown spots with a yellow border on infected leaves

Close-up of oval-shaped, brown spots with a yellow border on infected leaves

Close-up of an oval-shaped, brown spot with a yellow border with reddish-colored spore-producing bodies ("pycnidia") barely visible against the color of the surrounding infected tissue.

Close-up of an oval-shaped, brown spot with a yellow border and reddish-colored spore-producing bodies ("pycnidia") barely visible against the color of the surrounding infected tissue.

Close-up of an oval-shaped, brown spot with a yellow border and reddish-colored spore-producing bodies ("pycnidia") barely visible against the color of the surrounding infected tissue.

Close-up of an oval-shaped, brown spot with a yellow border and reddish-colored spore-producing bodies ("pycnidia") barely visible against the color of the surrounding infected tissue.

Dark-field observation of infected leaf tissue with many spore-producing bodies ("pycnidia") and a measurement scale

Dark-field observation of infected leaf tissue with several spore-producing bodies ("pycnidia") and a measurement scale

Dark-field observation of infected leaf tissue with several spore-producing bodies ("pycnidia") and spores with a measurement scale

Dark-field observation of asexual spores of the fungus Stagonospora nodorum with a measurement scale

Asexual spores of the fungus Stagonospora nodorum with a measurement scale

Asexual spores of the fungus Stagonospora nodorum with a measurement scale and measurement of some individual spores