Martin Harvey's picture

Kitenet - European Pear Rust - 14th September 2008

Observed: 14th September 2008 By: Martin Harvey
Berkshire Moth GroupFSC - Field Studies CouncilSoldierflies and Allies Recording SchemeBuckinghamshire Invertebrate Group
Martin Harvey’s reputation in Fungi and LichensMartin Harvey’s reputation in Fungi and Lichens
Gymnosporangium sabinae - gall on Pyrus - Great Kimble 1
Gymnosporangium sabinae - gall on Pyrus - Great Kimble 3
Description:

The rust fungus Gymnosporangium sabinae causing a gall on a leaf of a cultivated Pear (Pyrus) tree. Photos show upperside and underside of the leaf and gall. I like the colours.

Identifications

Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.

Species with which European Pear Rust (Gymnosporangium sabinae) interacts

Comments

miked's picture

I don't know this species.

I don't know this species. i seem to recall the standard work on a number of this type of fungi was out of print for many years, not sure if its available again now or if another work has taken over.

Jonathan's picture

I think your ID is correct

The AIDGAP key to galls by Redfern, Shirley & Bloxham (2002) says that 2 fungi cause galls on Pyrus (pears).

Your photos of the upper and lower surface of a leaf match what they say about Gymnosprorangium sabinae:
Orange spots on leaves
slight swellings on underside; acorn-shaped aecia closed at tips with lacerated sides.

The other species is Taphrina bullata
"Leaves with blister-like swellings convex above, concave and lines with asci below.

Jonathan Silvertown

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)

Martin Harvey's picture

key

Yes, it was the AIDGAP key that I used.

Martin Harvey
Biodiversity Observatory

----
Entomologist and biological recorder

Jonathan's picture

You can now add the scientific name

Jonathan Silvertown

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)

dejayM's picture

298

What companionship you had in those days, you four.
I am struck by the similarities tween this and my Gymnosporangium cornutum http://www.ispotnature.org/node/435315
ðerek

Jonathan's picture

Yes, back then it was almost

Yes, back then it was almost just us. Now there are >44,000 iSpotters including the South Africans who will be arriving very soon with their own community.

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)