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Hi figrat. Rhubarb does not like to be planted too deep . I usualy force a clump of mine, a differant one each year . This sometimes alters the colour of the leaves , Ive had a few pinkish leaves this year I put it down to being forced . What I would do is dig up the clump and replant it in a differant spot or in a large container . My friend always grows hers in home made pots using old tyers. she puts about 4 together uses this and tops with well rotted manure or chicken manure pellets. She swears by this method .
Myself I wouldnt fancy it though she swears blind it does not taste rubbery !
I am having the same problem and my local people seem to be stumped. The most logical suggest some kind of spore based problem but one online source suggested a bacterial based problem. No solution is available and since the bacterium is soil resident it is recommended not to attempt rhubarb again in the same place, and maybe not in the same garden. The red leaf disease seems to be about the only thing that will kill rhubarb. Just my luck I have it in my garden at my new house!!
We don't seem to have the rhubarb red leaf problem here in the UK thank goodness - google suggests that it's a problem of Northern America - you'd be better enquiring on a US site.
Over here if the leaves are going red it's usually drought or because it's late in the season and the leaves are dying off.
Sorry I can't be of more help.