Anyone know what this is on Rhubarb leaves?

If it's a fungal infection, a systemic fungicide will, at least, slow its spread.

It it worse on the top of the leaf, or the underside?
 
Thanks for all the replies folks.

I'm not going to spray anything on it. I would have to go out and buy something and if I was going to do that I would be as well to just buy a new plant and put it in another part of the garden.

I will try feeding it as I need to feed a few other plants in the same part of the garden this year, and maybe put down some mulch. It already seems to be getting worse since my OP, so I am not holding out too much hope for it!
 
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