at 50 days you have min 20-30days left some strains go past 80 days but the plant will tell you. Still all white haired and starting to get nice and frosty maybe 2-3 weeks left for neuts I'd go light on your Veg neuts concentrate on bloom neuts (if you have any bloom boosters now is the time to use them) then 1-2 week flush. I posted the link last night about when to harvest for Auto's give it a read really good information in it.
For defoliating if the leaf looks pretty much sucked to death I give them a light pull downwards and if it comes off more light and air for the main bud sites.
