Week 8 flowering problems

This is my 3rd grow and encountering problems I have not ever had before. Growing in tent, Strain Trainwreck Feminized, OF soil, 5 gallon fiber pots, FF trio nutes, 600 watt (adjustable 50%-100%) on 100%, MH and HPS. Tap water allowed to sit at least 24 hrs, pH varies 6.4-6.7. 6" vent ducting going thru a carbon filter,the light then out of the tent. Are in week 8 after going 12-12. Leaves have some tips brown, and others have brown spots in various places. Not sure if it is nute burn or a watering problem as I have not encountered it before. I know there is some PM which I tried treating with Neem Oil last week, did not seem to affect it much. So I sprayed with Hydrogen Peroxide 3%. Did a pH water flush on 8/31 with 3 gallons each plant. Have not fed since. Meter show still damp soil under the first couple inches. Hope I provided enough info. Any help would be appreciated, would hate to come this far to lose these! I do plan on a Hydrogen Peroxide rinse after cutting down per Jorge Cervantes You tube video. Thanks!

You are going to have some good smoke regardless. Congrats

I don't think you are going to lose them. Just give them plain ph'd water for a few weeks while they finish. You say you flushed them with 3 gallons of water per plant? If you're using 5 gallon pots, I believe you need to use 10-15 gallons to really flush the plant.

im not sure whats up with the spotting, at this point I don't see trying to make a correction

like ^^ said..water only and youll be good

I cant tell if its frost or just the pic but it kinda looks like powdery mildew ... but it could just be the pic or the frost

Over fert. You don't need to add much fert to OF. It has fert in it already. dark green leaves and dying tips mean over fert.

Thanks, will just use plain water pH'd, as far as the PM, treated it yesterday again with hydrogen peroxide 3%. From my research it seems when I harvest, I wil be able to "wash" them in a water/hydrogen peroxide bath, then gently rinse in water, dry off the excess water with a fan, then trim and hang to dry. If anyone has any experience with this process and if it works would love to hear your comments. Don't want to use Neem oil on the buds this late in the game.

fcchief said:

Thanks, will just use plain water pH'd, as far as the PM, treated it yesterday again with hydrogen peroxide 3%. From my research it seems when I harvest, I wil be able to "wash" them in a water/hydrogen peroxide bath, then gently rinse in water, dry off the excess water with a fan, then trim and hang to dry. If anyone has any experience with this process and if it works would love to hear your comments. Don't want to use Neem oil on the buds this late in the game.

Click to expand...

ive not done it but ive seen friends have success washing with baking soda, lemon juice, peroxide

but I don't know the exact amounts

im4satori said:

ive not done it but ive seen friends have success washing with baking soda, lemon juice, peroxide

but I don't know the exact amounts

Click to expand...

Do you know how he used the baking soda or lemon juice for a wash, or if it was effective??

fcchief said:

Do you know how he used the baking soda or lemon juice for a wash, or if it was effective??

Click to expand...

https://www.youtube.com/results?search_query=powdery+mildew+wash

I don't recall the amounts of each but im sure these videos will tell you

wash them in tote 1 first by submerge and agitate thoroughly

tote 2
rinse
hang with strong fan blowing directly until they surface dry

ive also seen dudes try and blast it off with low volume high pressure rinse if its real bad and then do the wash

supposedly it works pretty good!!

edit/add
I just heard back from my firend

he said after he was done you couldn't even tell and he also said a couple had PM real bad and after the wash you youd never know theyd had pm
and he said he only washed each branch for maybe a minute (becuase it was his first time trying it and he was worried) which is much less than what the tutorial suggest

but it still worked good