Taphrina farlowii

Black cherry leaf curl fungus

Description

Black cherry leaf curl fungus Taphrina farlowii is a fungal pathogen that infects black cherry (Prunus serotina), causing deformation of leaves, flowers, and fruits. The fungus induces gall formation, which results in abnormal swelling and curling of affected plant tissues. Infected flowers and fruits may become misshapen and fail to develop properly. Spores of the fungus are microscopic, and the pathogen primarily spreads through airborne spores that infect young tissues in spring.

This species was likely introduced to Europe along with its host tree, and it has since established itself in various regions. While its impact is often limited to aesthetic damage, severe infestations can lead to premature leaf drop and shoot dieback, reducing the overall vitality of affected trees. In areas with high infection rates, it may act as a natural control for the invasive spread of Prunus serotina.

Symptom

On infected black cherry trees, galls form on leaves, flowers, and fruits, causing twisting and swelling. Affected leaves become curled and deformed, while infested fruits often fail to develop properly. In severe cases, young shoots may wither and die.

Tree Species: Black cherry

Part of a plant- attacked: Leaf / Needle, Fruit / Seed, Branch

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: Yes

Present in EU: Yes