Box blight -reusing pot compost?

I've just cut down and burnt a big box ball that I think had blight . It was in a terracotta pot (1 of 2) with J.I No.3 (repotted earlier this year.
I've now put a watering can full of water containing disinfectant on the pot but what should I do with the soil - can I now reuse it on the garden elsewhere?
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You can do that as long as there is no more Box in your garden.
thanks borderline. Unfortunately I have lots of box!
Then it is not worth the risk, in my opinion.