Unfortunately bud rot is part of the OD game EVERYWHERE ! Remove it as soon as you see it, is about all you can do. I'm in Missouri and I grow more than I need to compensate for problems like this. I'm sure you know, but air flow, heavy dew, high humidity, high N levels, and dense growin plants are all contributors to BR. Do what you can to alleviate these things. As a last resort, after you remove BR buds from the stem, you can spray the area on the remaining stem with a 50/50 solution of hydrogen peroxide. This will kill the remaining spores that might be hangin around. Happy growin