Exobasidium japonicum

Alternative names
Azalea leaf gall fungus
Description

The fungus Exobasidium japonicum causes galls on the leaves of azaleas, which are typically the deciduous species of Rhododendron with funnel-shaped flowers and 5 stamens. The galls are irregularly swollen, pale green at first then chalky white.

Similar Species

Similar galls Exobasidium rhododendroni) are formed on garden Rhododendrons - usually the evergreen varieties and species, with bell-shaped flowers and 10 stamens

Identification difficulty
Recording advice

Provide photos showing gall and host plant; ensure you have identified and noted the host species

UK Status

Widespread in Britain, though not well recorded.

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map

MAP KEY:

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

UK Map

Species profile

Common names
Azalea Gall
Species group:
Fungi
Kingdom:
Fungi
Order:
Exobasidiales
Family:
Exobasidiaceae
Records on NatureSpot:
1
First record:
17/06/2018 (Pearce, Ray)
Last record:
17/06/2018 (Pearce, Ray)

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% of records within its species group

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