Hazelnut (Corylus avellana)-Sooty Mold

Black fungal sooty mold growth all across this leaf.

Insects on the underside of this leaf are responsible for the honeydew leading to sooty mold.

Anything honeydew drips on gets covered with sooty mold including leaves, stems, branches, and nuts.

Stem of 'Lewis' hazelnut with back sooty mold.