The reason I use individual circular cages is so I can move the cages each year and keep a substantial distance between each one. The blight can spread too easily in tight spacing.
I got blight bad for a couple years in a row with some Bradley pinks
I pulled all my cages one fall and while I was BBQ’ing about 15 butts, I slow-rolled all my cages through a scattered bed of hickory slab coals on the ground.
I switched up varieties also. Not sure if helped anything but I had a hunch those rusty cages might be holding virus too.