Azalea GallExobasidium azaleae Peck

Taxon ID: 10406

Summary

Azalea Gall (Exobasidium azaleae) is a species in the genus Exobasidium.

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Records

MBP has 17 records spanning four counties (Caroline, Garrett, Howard, and Montgomery).

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Media

5 displayed media

An Azalea Gall on a Pinxter Flower in Howard Co., Maryland (5/13/2017). Found by Felicia Lovelett and determined by Robert Solem.

Azalea Gall (Exobasidium azaleae Peck) Media by Kurt Schwarz View Record

A split Azalea Gall on Pinxter Flower in Howard Co., Maryland (5/15/2017). Spores will not form until later in the year after the gall becomes covered with a white mold-like growth. Determined by Robert Solem.

Azalea Gall (Exobasidium azaleae Peck) Media by Joanne Solem View Record

Azalea Gall in Howard Co., Maryland (5/15/2017). (c) Joanne and Robert Solem, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>).

Azalea Gall (Exobasidium azaleae Peck) Media by Joanne Solem View Record

Azalea Gall in Garrett Co., Maryland (6/27/2020). (c) apistopanchax, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>).

Azalea Gall (Exobasidium azaleae Peck) Media by Josh Emm View Record

Azalea Gall in Garrett Co., Maryland (5/18/2019).

Azalea Gall (Exobasidium azaleae Peck) Media by Jim Brighton View Record

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Details

Status

Some studies have suggested that species of Exobasidium are host-specific and limited to closely related host species. Exobasidium azaleae occurs on Rhododendron periclymenoides. Historically, Exobasidium on Rhododendron in Maryland was referred to Exobasidium rhododendri. The current hypothesis (12/2022) is that Exobasidium rhododendri is limited to European species of Rhododendron that would only be found in cultivation in Maryland (GallFormers.org).

Description

Galls, caused by the fungus Exobasidium azaleae, appear occasionally on Pinxter Azalea in the spring.

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