Taphrina wiesneri is a plant pathogen causing witch's broom, or plant gall formations, on cherry trees (Prunus & Cerasus spp).

It is an important pest species of the ornamental cherry Cerasus X yedoensis in Japan.

[1] Komatsu et al. found that hyphae of T. wiesneri overwintered in symptomatic shoots of Cerasus × yedoensis.

This is in contrast with the overwintering of other Taphrina species such as Taphrina deformans that over winter on leaf and twig surfaces before initiating infection.

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