Some seem to say,
SDS infection occurs within 72 hours of planting,
Cool wet conditions are a contributing cause of SDS.
Some say, Saltro and Allevo treatments can raise the SDS score by 1 point.
One would think that some varieties would be more tolerant than other varieties.
I am no help in this regard.
As mentioned, SDS RCR BSR, all look the same until the root is examined.
A lot of RCR and BSR cases are just classified as SDS.