Hi,
Relatively new to allotmenting, this is only our second year, and we've just noticed what looks like a leaf-yellowing affecting almost half of one of our beds. It looks like it's spread through the turnips, kale, cabbages, and brussels sprouts. I've had a look at various sites but with my limited experience I've hit a bit of a dead end. Does anyone know what this is and, if so, is there anything we can do about it?
Any advice is massively appreciated, thanks.