White powdery stuff on Camellia

Can anybody tell me what this is please? It's powdery (like talc) and has only appeared on one Camellia, which is on a table with over a dozen others.





I can wipe it off with my fingers but would like to know what is going on to cause it.

It looks like it's splashed on the leaves and I've wracked my brain trying to think what could have made it do that but am drawing a blank.

It's isolated around that one area.

Thanks

 

Could you have sprayed your plants with water after not clearing out the sprayer from a previous application of something? It does look like water drops that have evaporated leaving a residue behind.

I was going to say 'Powdery mildew' but it aint that. I should isolate this plant, just in case. Hope all is well, Cheers, Tony.

 

Thanks Tony. The only thing I have sprayed it with is some Seaweed with sequestered iron. It's just odd that it's only happened on this one plant and not the other dozen or so that are with it.

Hey ho, you live and learn.