what is wrong with my pelargoniums ? Yellow sand spots on leaves

[peridito]

Hope pics attach and are clear enough .I thought at first neighbour had been DIY and wood dust had settled .

Is it cucumber virus ?

Following as mine do too.

Could be powdery mildew, I can't quite tell from the pictures. Is it somewhere shady and not well ventilated? My Japanese anemone had a very bad case so I moved it to a brighter, less "surrounded" position and sprayed with very watered down apple cider vinegar.

'll try and take a better photo later .It's v pale yellow spots all over the leaves of all plants .Looks like wooddust .

Geranium rust?

It wouldn't be cucumber virus, A lot of these things are host specific, so if the name has a plant name attached, like "cucumber virus", you can usually feel confident that it'll affect only cucumber and related plants.

The fact it looks like sawdust, ie it's on the surface rather than an integral part of the leaf, points to a fungus (rust) rather than a virus.

it's on the surface rather than an integral part of the leaf, points to a fungus (rust) rather than a virus oh that makes sense ,thank you!

I'm (hopefully) attaching better pics which might help .

I saw this on RHS ( and similar elsewhere ) so naturally ( for me ) assumed the worst .
Cucumber mosaic virus (CMV) is one of the most common plant viruses, causing yellow mottling, distorted leaves and stunted growth in a wide range of garden plants, not just cucumbers

But the WWW supports so many ,often confusing/conflicting views so tend to agree with you!

That looks more like some kind of mechanical damage, as though the leaves have been hit by something. Hail?

ok - yes I think probably rust . Not surprising ,given the weather .

I'm going to try spraying with a homemade fungicide ,not sure whether to go with aspirin or vinegar ..

chemistrycachet.com/easy-homemade-fungicide-spray-for-plants/

Nan,sorry only just read your post .Yes we have had hail .And a biblical downpour of rain .

@peridito, I would wait before spraying - see if the new growth comes through normal.

Yes, from that new photo, that doesn't look like a disease

But the WWW supports so many ,often confusing/conflicting views so tend to agree with you! I'd go with the RHS rather than me!