Mossy Willow Catkin Gall - Causer unknown (Mossy Willow Gall)


This gall is actually an abnormally distorted catkin, and is probably caused by a virus or phytomplasma, but the precise causer has not yet been identified. It used to be thought that it was caused by the mite Stenacis triradiatus but it now seems that the mites just choose to live in and around these galls. The galls can be very large and either have the appearance of a green straggly mass rather like the witches broom gall seem on birch, or can be more of a woody mass.

Identification difficulty

On various willows.

When to see it

Summer growths persist into winter when they can be particularly prominent.

UK Status

Status in Britain not known.

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map