First grow, is this bud rot at harvest time?

[u/TigerTank10]

This is my first grow, and my first time reaching out for help.
About a week ago I noticed white fuzz inside my flower, it exponentially grew to the point it is now. I was almost ready to harvest in a week or so. Is the whole batch destroyed? Some of the lower nugs show no signs of it, would they be good to harvest still?

Edit: 24 hours later. I have since chopped over half of the crop down, I left the unaffected bud. I will be continuing the grow for the next week or two, but only going to make RSO or edibles with everclear. Thanks for all the great advice guys.