I have regularly double dug my beds, so that doesn't seem to be the answer. I think next year will be all containers and I will move on from there. I wish I could find someone to steam treat my garden. When I worked in commercial GHs, we steamed the beds after each croup, no weed seeds, no fungus, just perfect soil. Burning your waste on the garden helps, just not hot enough. I hope to find a solution. Maybe using a section for compost and feeding it to be hot-hot-hot.

Good luck!

I know there are a few soil-borne diseases that are combated by other soil organisms, so that some fields with lots of "good germs" can "drive away" soil diseases that plague other nearby fields.

I don't have any reason to think that blight is one of those deter-able diseases.

I'm a sucker for peas and especially beans! Just for the hoarding though and not for eating specifically I loooooove the sight of shelf full of glass jars filled with all those different sized and colored dry beans.

Have some issues with them though...One is that bean weevils readily infest my dried crops. I've had an entire harvest spoiled and binned last year afer I discovered the buggers in my jar...This year I've put them in the freezer at -20°C for a day or two to kill any eggs/larvae. But the thought of cooking and eating any resident bugs is just apalling...
Second is that any new generation of beans seems to differ from the previous ones. One variety went sligtly lighter in the mottling and two other ('Crusader' and 'Dunajek') produced quite fat seeds this year...I had several varieties planted next to each other so I don't know how much of it is down to possible hybridisation...
Third: the beans take fricking ages to dry for freezing/storage