cut worms will go inside of buds and eat them from the inside out and it will die and have a brown appearence just like what you said but I am not positive if that is what it is you see any worms when you broke it open?
u.g.u Reviewed by u.g.u on . dead bud today i went to check on my outdoor plant and all the buds were looking healthy except one small bud that was brown and dead. at first i thought it was rot or mold but there were no signs of it.. it was just dead, and it had dried in the sun and turned brown so i smoked it. got me high and wasnt too harsh so i dont think it was a fungus or anything. Rating: 5