This is a new one on me. White spots on leaves.
It's appeared fairly quickly, and seems to be getting worse.
It's not rust, and the spots won't rub off, so I'm assuming it isn't a mould.
Any ideas? Here's a picture of some onion leaves.
It's also on some nasturtiums which have sprung up in the onion patch, plus the tomatoes and brassicas also have white spots on the leaves.
My guess is it's a problem with the nutrients in the soil, but I've no idea what it is, or how to put it right.
Thanks.
Guy