Possible Rust on Salix

Plant diseases
Post Reply
marksteer
Frequent user
Posts: 348
Joined: Thu May 14, 2015 6:08 am
Location: Glamorgan VC41

Possible Rust on Salix

Post by marksteer » Wed Jul 08, 2015 9:05 am

Not sure if Salix caprea - lots of hybrids! On roadside - leaves look bigger than what I assume to be S.caprea in scrub woodland but dimensions in Francis Rose fit.
If this is a Rust possibly Melampsora caprearum? I think unlikely to be M.epitea. Another specimen drying for Nigel!
4th photo lower USBx10, 3rd upper x10, 2nd lower x60, 1st upper x60 (haven't got to grips with order of added photos!)
Attachments
USBx10 Coity 7july2015.jpg
USBx10 Coity 7july2015 2.jpg
USBx60 Coity 7july2015 1.jpg
USBx60 Coity 7july2015 2.jpg
'The more I know the more I realise I don't know'

User avatar
Lancashire Lad
Frequent user
Posts: 874
Joined: Wed May 13, 2015 11:59 am
Location: Red Rose County
Contact:

Re: Possible Rust on Salix

Post by Lancashire Lad » Wed Jul 08, 2015 12:14 pm

marksteer wrote: . . . (haven't got to grips with order of added photos!)
Hi Mark, see: - viewtopic.php?f=2&p=1225#p1225 ;)

Regards,
Mike.
Common sense is not so common.

User avatar
adampembs
Frequent user
Posts: 1529
Joined: Wed May 13, 2015 11:40 am
Location: Pembrokeshire
Contact:

Re: Possible Rust on Salix

Post by adampembs » Wed Jul 08, 2015 12:30 pm

I don't think this is a rust. Generally, I think you are looking for raised spots, or sometimes eruptions. Irregular spots like these are likely to be something else. It might be a rust but without sori, we cannot assume it is. Spotting can be caused by ascos, or even bacteria.

I was looking at some irregular spots on ivy and came to conclusion it was most likely bacterial.
Adam Pollard
Site admin

User avatar
Lancashire Lad
Frequent user
Posts: 874
Joined: Wed May 13, 2015 11:59 am
Location: Red Rose County
Contact:

Re: Possible Rust on Salix

Post by Lancashire Lad » Wed Jul 08, 2015 12:47 pm

adampembs wrote:I don't think this is a rust. . . .
I'd agree Adam. It doesn't seem to have the right characteristics (if my interpretation of Wilson & Henderson's description of Melampsora is correct).

Although, I'd be interested to see if anyone has any thoughts on what appear to be miniscule clumps of pale brown & white spheres in the affected area.

Enlarged section from Mark's photo:-
Tiny Pale Brown and White Spheres.jpg
Regards,
Mike.
Common sense is not so common.

marksteer
Frequent user
Posts: 348
Joined: Thu May 14, 2015 6:08 am
Location: Glamorgan VC41

Re: Possible Rust on Salix

Post by marksteer » Wed Jul 08, 2015 1:56 pm

Many thanks Adam and Mike. I wasn't sure that this was a Rust! Possibly specimen was damaged in transit. Specimen for Nigel though. I'm waiting for copy of Dutch Rust Fungi book which I hope will help me.
'The more I know the more I realise I don't know'

Post Reply