Pistils turning brown...

One of the many symptoms of my plant's illness is getting bad - some of my plants' pistils are turning burnt brown and I don't know what to make out of this.. What could be the reason and what could be the end result of such a thing?

How old is this plant. Pistols do turn brown at the end of flower cycle(12/12).

Nope, dude, they are a bit after the 3d week, they are AFs.. :/

Here are some pics - the bottom ones are totally screwed. Could it be by any chance that the in line fan is blowing directly at this particular plant almost constantly?? And the first pic is of something new that scares me also....

My plant has a fan blowing on it constantly so I can assure you it's not that.
The first picture just looks like either nute burn or nute deficiency. Have you been nuting it?

Well I havn't used any nutes - last watering was just pure water with balanced ph. I used guano 2 times though but in very moderate dosage. The last guano watering was almost a week ago so I wouldn't think it's over nuting.. I'm waiting for some bud blood and bloombastic to start using them but they haven't arrived yet..

Those hairs at the base of the branches are preflowers, plants vegged for extended times get those even with long light periods. Means the plant is ready and wants to bud. I'm sure an auto flower is always ready.
If plant growth is being held back for arrival of nutes that would go far in explaining the preflowers going brown and what appears to be nute problems on the leaf. A weak solution of general purpose vegging nutes would not hurt the budding to come at all, might even perk it up some while waiting.

Thank you, Phaeton! This clears things out, I was hoping for such a positive outcome Nutes should be arriving today so I'll get to the feeding as soon as possible.
Cheers!