Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Thanks for your help, David. We've removed the leaf in question and the peach tree doesn't seem to be showing any further signs of this fungus. We grow everything organically in our garden so there isn't really anything we can do apart from removing infected leaves.
Interestingly, this peach tree wasn't purposely planted in our garden. We must have unwittingly put a peach stone on the compost heap and it germinated. We have had small numbers of peaches from the tree in previous years but it's still fairly young.
and sorry to hear you have this pest, it's quite a nuisance. Make sure you burn or move the leaves offsite just to be sure. Hopefully there won't be any lasting damage.
if you edit your observation so it is in the fungi group, then the funguys will know to look at it and confirm the identification.
The gall in the left picture starts showing some colour changes and irregular growth. As said before peach leaves deformed by this Taphrina species tend to get malformed over larger areas and to produce red pigments. Shiny fungal galls can always look very similar to some insect galls. When the Taphrina deformans infections get rather old, later in the year they tend to get more dull and possibly whitish due to the fungal spores being formed on the surface.
Lat/Lng: 52.7, 0.3
OS grid ref: TF5820