Help please! Is this bud rot?

Aloha! Its day 49 of flowering for my og kush and one stem just started to turn brown. I've lost the majority of a plant before due to bud rot so I am being extra careful. Even though there's a lot posted on bud rot on line, my eyesight sucks and I'm not completely sure if this is what's going on. Here's a pic of my plant and what I think may be the rotting bud. Anyway will you guys please confirm before I cut it ? Much Mahalo!

If you dig through the destroyed buds you may still find whats eating it up. Could be a bug or possibly from too much humidity for that strain.

You need to find what's going on as it will more than likely take the whole plant down...

Thank you! I cut the affected bud and am inspecting it.

Yup, if not it will be. Remove all dead material wash your hands afterword then look for more. If you touch that crap and touch your plant again you could spread it. The pictures not very clear, Its hard to tell if its sporing. Maybe a bug got in it and killed it.