I have been having an issue for the last 2 weeks, and I cant figure it out

White widow
2 feet high
7th week of veg
ph 6.5 runoff 6.5
temp 80
1 400mh 1 600hps
fox farm grow big and tiger bloom, big bloom
soil = 80% pro mix 20% oceon forest
water every 3 to 4 days

I have 7 WW who have been growing great except for a little nute burn early on, was feeding them grow big througout veg and they were doing fine, about a week before i transplanted them to 3 gall pots I noticed some rust looking spots on some of the older fan leaves, at that time they were just on a few leaves, so I thought it was a mag def, so when i transplanted them i water in epson salt, but it didn't help, it just kept getting worse, i espicallyu noticed it spreading very quickly on 1 of the plants the on that grew the tallest but it is also a very thin plant more on the sativa side, i thought it wasnt a mag def so i watered in a heathly dose of grow big because i had not been nuting the very much, so I gave them the 2-3 teaspoon per gallon......but the problem just kept spreading to lower leaves, the problem hasn't been showing on the younger leaves till recently, anyways after i noticed they kept getting worse i gave them a foliar feed of the epson salt..for a few days.........but it still didn;t get better....so i did some more research and I thought it might be phosforus def, so I gave them their first dose of tiger bloom about 4 days ago and then I gave them another dose yesterday, they seem to getting better, but it might just be my imagination, but it dosent seem to spreading as fast, but is still spreading, They are still growing very fast and bushy but this problem keeps making the fan leaves to die...............................the leaves have rust colered spots and then after a few days continure to get worst turn dark brown, crispy a die, and the leaves are curled up, i don't think I over nuted them becuse i did that earlier and they showed totally different symptoms, then the leaves curled down and were wrinkly, but the only then i can think of is mag, phos, or cal........sorry this thing is like so fucking long but i wanted to give as much detail as possible

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It could be over fertilization, but more likely it is due to the pH being off. Too high or too low a pH locks up nutrients in the form of undisolvable salts and compounds, some of which are toxic to the plants. Inconsistent mixing of the medium's components leads to "hot" the spots visible on your plants.

I am not really sure how your plants got to this point without noticing your plants were suffering. A little nute burn in the begging was a hint that the nute contents were toxic - adding more nute made the problem worst. Did you flush before you transplanted them?

A ec/moister meter would have prevented you from burning your plants - guessing only makes things difficult. Your plants are DONE!!!

I would start over, conduct more research, get the supplies you need to monitor your plants moister and nutrient levels etc.

Good Luck

yeah but the Ph isnt off and never has, I use bottled water, and i flushed them after I transplanted them twice but to no avail, I mixed the soil very thourhly so its not hot spots, the nute problem in the beginning was just a small problem affecting only a couple of leaves, and after that I used half dose of nutes for weeks with no problems and they were growing great with no sign of nute burn or problems..........why would they be DONE there is no way to correct the problem....here is a pic of how they look there 2 feet tall and very bushy i don't think it is time to toss them.....I need to put them into flower as soon as this problem is fixed

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maybe is low humidity.

its 40% so no

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damn brother, that's tough. i see this in coco coir a lot and think it may be high concentrations of potassium that are locking out the calcium in your plant. i know you said you flushed, but i would flush again and use plain water 1 or two times after that. then get you some cal-mag and take it easy on the fox farm for a while.

if your using so many nutes, could it be possible your not getting the quantities right?
maybe thats why they were growing fine when you was only giving them half the amounts. if i were u, i would give them npthing but bottled water. and see if that changes anything.

Yeah I thought it might be cal too, and I went to my hydro store to get some cal/mag (young stoners work there).....so I thought I might bring in a couple of leaves to show them.....so when i showed them the dude was like yo man you got to leave and because you let us know that you were breaking the law. I thought about afterwards and was like im a dumb fuck lol.....they were just watching their backs i could have been a cop or something...........so i couldnt get my cal/mag....i think I'm going to try go back....this was like 2 weeks ago...hopefully i'm not banned for life lol, is there anywhere else i can get some calcium like lowes or something, i might just have to order online. now i'm really think it is cal def since you said that, because I had read about the symtoms on grow faq a couple of weeks ago before i went to the hydro store and seems to be simalir to my problem......when you saw it coco did it look like small rust specs on the older leaves that than spread?

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I really hadn't been using to much nutes when the problem started so I don't think I was over nuteing them, I even used just plain water a few times when it started.......but since it was getting worse, i then nuted them the recomended dose carefull not to give to much.....btu i'm going to flush tonite again and just water with plain water, and try to some calcium to see if that helps, buit god damm I need to put these in to flower because there already waste high, and by the time of harvest they be over my head

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on grow faq it says cal def starts on the younger leaves.......but my problem is that it starts with older leave .......I keep having to cut the older leaves off but the younger ones come in great and thickin up but eventually subcumb to the same problem

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