Close-up of a single leaf spot showing darkened rings looking like a target.

Leaf spotting due to Early blight.

A stem canker due to Early blight.

Close-up of leaf spotting.

Close-up of the spores of Alternaria solani coming from an infected leaf spot.

Conidiophores and conidia of Alternaria solani.

A single spore of Alternaria solani.

Close-up of a single spore of Alternaria solani far left, a leaf hair in center, and back end of insect on right.