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Erineum Gall on Rowan

Posted: Sat May 30, 2015 6:17 am
by jimmymac2
NOTE: Topic moved from Rust/Smut/Mildew forum as requested.
(Retitled to assist with future searches)

Is this a smut? I found it on a Rowan leaf yesterday morning.
DSCN1968 r.jpg

Re: Smut on Rowan?

Posted: Sat May 30, 2015 9:48 am
by Lancashire Lad
I'm by no means certain, (a photo of the other side of the leaf might have been useful), but from what I see, I suspect that this might have been caused by some sort of leaf mine insect.

Regards,
Mike.

Re: Smut on Rowan?

Posted: Sat May 30, 2015 11:34 am
by Chris Yeates
Hi
Mike is close, but no coconut this time ;)
This is an "erineum" gall (in its early stages of formation) rather than a leafmine, and is caused by a mite rather than an insect: Phyllocoptes sorbeus. Mike is right in suggesting you would see a bit more by looking at the lower leaf surface.
compare with http://www.bioimages.org.uk/html/r152480.htm
Interesting that this was in Sussex (?) as it's generally thought of as a northern England/Scottish species; this map though:
https://data.nbn.org.uk/Taxa/NHMSYS0020190645 is totally 'underpopulated' - one sees galls of this on Rowan quite commonly all over this part of western Yorkshire. I presume the galls people have not yet got their records on to the NBN Gateway.
best wishes
Chris

Re: Smut on Rowan?

Posted: Sat May 30, 2015 2:19 pm
by jimmymac2
Thanks Chris and Mike! It was found in Sussex. I'll add a record on iRecord (that goes to NBN, right?), but is there a county recorder for galls I should contact?

Re: Erineum Gall on Rowan

Posted: Wed Jan 27, 2016 11:36 am
by SteveMcBill
Whereabouts are you Jimmy ?? I am sure your Local Biodiversity Records Centre would be very pleased to receive your record(s).

Steve