cut off impacted areas.. see if oyu can salvage... may want to dry and cure differently -- not in normal spots.. smaller amounts in smaller boxes or jars etc to reduce risk and avoid contaminating your normal gear.
you can spray it with an anti-funal spray, but it'll certainly be smoked or eaten at thsi point if sprayed on the plant, so even if it sas "organic" that doesn't mean it is safe for that use. e.g. neem oil is not safe to spray on your plant this late.
make sure it's not just some cobweb that somehow got caught. obviously, a web doesn't spread so you may have elimiinated that possibility.