Marriott's view is at min 42 of the video. I would imagine that perspective is outdated, given that there is now scientific proof that it's pathogenic fungi that are the problem and root growth is affected by them.
"I wonder how professional rose growers, DA for example, grow their
roses. They must grow roses in the same spots after digging them up to
sell as bare root. Yet they don't have a problem."
David Austin hmself wrote that you should never plant a rose where another rose had been. But yes, it would be interesting to know how field rose growers deal with it - if they use chemical approaches. I think dismissing RRD as nonsense, as Marriott does in the vid, is not very helpful. Gardeners are worried about it, because you can lose years waiting for a rose to get healthy, if it's planted in the wrong spot (as I have).
I currently have a rose in a small spot by my front door that I want to swap out, and the question is relevant for the new rose planted there. Before now I've dug out a wide and deep circle of soil around an ex-rose, added a lot of manure mulch, but it didn't seem to help at all. I kept the new rose in, and about four years later the rose is beginning to thrive.
..they practice rotation, usually not returning to the same growing field for 9 years, leaving it either fallow or grow a different crop...
..there are rose fields just around the corner from me, the nearest was last used in 2015 but has not been used since for roses.. I think I saw potatoes in it last time I went past..
.. most of these roses are David Austin's grown for a rose nursery operating from Cheshire, but they use rose fields local to me in East Anglia..
Well I've watched that and I don't think he claimed it's not a real thing, just that he doesn't concern himself too much with it.. good soil husbandry can alleviate most of the issues, which is what I think he practices..
“To me RRD is just a symptom of a completely worn
out soil …. it hasn’t been mulched for 40 years, it’s been trampled to
death… the soil is biologically dead ."
Surely this is demonstrably wrong on any number of levels. There are any number of us who have dug out old soil from the site of an ex-rose, refilled the hole with good new medium and mulched heavily with manure, over decades, and found this didn't help. I can't see why the soil of a forty year old would be "biologically dead".
If you put a barrier to old pathogens built in the soil, yes, it would help.
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..there are rose fields just around the corner from me, the nearest was last used in 2015 but has not been used since for roses.. I think I saw potatoes in it last time I went past..
.. most of these roses are David Austin's grown for a rose nursery operating from Cheshire, but they use rose fields local to me in East Anglia..