Those brown pistils can be LOTS of things.
The most common is that those pistils were touched or damaged.. even a leaf bumping the pistils from the air flow will cause them to brown and receed, that has nothing to do with bugs or deficiency.
Find a bud site with a leaf resting on it, the pistils will have browned and receded.
Very good to know!!! Thank you!! My last grow I didn't get to learn much about flowering cause of all the spraying and shit I had to do to fight those BM's so this round I have lots to learn!!