Wallflowers and roses

Have just been told by neighbour that wallflowers can affect roses, e.g. 'don't plant wallflowers where you want to plant roses in the future'.
This started me wondering about whether wallflowers could trigger 'Rose repeat disease'.
Does anyone know about this?
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Never heard of that one, I'm afraid.
Part of the brassica family so club root could be a problem but still can't see a connection to roses.
That could be it. The person who told me about this has had the information passed down through the family as a gospel truth.