Again, there's a difference, though maybe it's only one of perception or degree. If the pathogen evolves a virulent trait, the host plant evolves a resistant trait, and things stay in balance. But gradually it ebbs. Cook draws his hypothesis of what is happening from natural systems. There is a conversion in the soil from a conducive state to a suppressive state.
Organic farmers say that conversion to organic methods takes about three or four years.
No-till farmers say the same thing about their fields. First they have a lot of problems, then a conversion. But no one knew for sure what exactly was happening until Cook and his colleagues explained one part of this conversion phenomenon. It is the first case of conversion that has a scientific explanation. But it also shows the complexity of explaining the phenomenon.