Rust on borage

[adampembs]

At least, I think it’s a rust.

[Lancashire Lad]

Might be way off, but it looks more like some sort of powdery mildew than a rust.

(This is where Chris would come in very handy!).

Regards,

Mike.

[diggleken]

Doesn’t have the look of Botrytis cinerea when it was on my Tomatoes…….but I’m not able to help any further………..

[Lancashire Lad]

Just throwing Golovinomyces cynoglossi into the mix as a possibility – but you’ll need to get it under the microscope Adam.

See:-

http://www.fieldmycology.net/FRDBI/FRDBIrecord.asp?strAssoc=Borago+officinalis&strName=Golovinomyces+cynoglossi

Also, some others that have been found on Borage:-

http://www.fieldmycology.net/FRDBI/assoc.asp

Regards,

Mike.

[Chris Yeates]

This is as Mike suggests Golovinomyces (Erysiphe in older books) cynoglossi, common on a large number of genera within the Boraginaceae – often whitening entire clumps of Myosotis arvensis etc.

No need for microscopy in this case; clearly a PM and it’s the only mildew which Braun lists on this host in his huge (707 pp.) Taxonomic Manual of the Erysiphales (Powdery Mildews).

cheers

Chris

[adampembs]

Thanks, Chris

[Author]

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