Leaves 'rusting', nute burn?

W

w33dk1d

Active Member
I recently pruned this mother plant for cuttings and upped the ppm to around 900 of GH Floranova Grow. It is in a DWC hydro setup. Growth looks pretty good, but leaves appear to be rusting - that is, there are brownish/orange spots scattered across about half the leaves. Anyone know what the problem is?

Thanks
 

Attachments

wilsoncr17

wilsoncr17

Well-Known Member
You're pH is too high. It's a Magnesium/Calcium deficiency as a result of the lockout of Iron due to the high pH. pH goes too high when the plant releases excess toxins into the water (basically the plant taking a shit). To combat this problem add about 5ml of H2O2 per gallon every 5 days. That will keep your pH a little more regulated, you still should be testing pH at least once a day to maintain. Should be between 5.8-6.4.

Happy Growing.
 
W

w33dk1d

Active Member
Could the problem be that my pH is too low? I just now checked and it's around 5.2, although my meter is pretty shitty... but even if the meter is off by +- 1.0, the pH can't be too high.

Thanks for the reply.
 
wilsoncr17

wilsoncr17

Well-Known Member
Lol yeah, if your pH is too low you actually lockout mag/cal.

If you lockout Iron, your plant won't take in cal/mag and if its too low its not gonna take up any cal/mag.

Either way the rusting is generally a cal/mag deficiency.
 
W

w33dk1d

Active Member
Well shit... I have pH down but not pH up. After mixing the nutes with tapwater, the pH seems to be down in the high 4's or low 5's depending upon the ppm. Should I try to correct with baking soda or just wait and get some pH up or what?
 
R

reeferMaster

Well-Known Member
i have the same problem with my leaves. did you get nutrient water on your leaves? did you spray the plants with to much nutrients? uncle jons blend from omari has some good shit in it. im going to spray my plants in the morning with uncle jons blend and plant amp(calcium) and a little bit of mildew cure. im thinking my leaves turned like that becuse when i sprayed then a week ago my mixture was really strong and had all kinds of stuff in it. the plant should eventually even out if it were my plant i would probly just rip the leaf off. i have no idea for a substitue for ph up? lemon jucie is ph down right?
 
W

w33dk1d

Active Member
reeferMaster said:
i have the same problem with my leaves. did you get nutrient water on your leaves? did you spray the plants with to much nutrients? uncle jons blend from omari has some good shit in it. im going to spray my plants in the morning with uncle jons blend and plant amp(calcium) and a little bit of mildew cure. im thinking my leaves turned like that becuse when i sprayed then a week ago my mixture was really strong and had all kinds of stuff in it. the plant should eventually even out if it were my plant i would probly just rip the leaf off. i have no idea for a substitue for ph up? lemon jucie is ph down right?
Click to expand...
Nope I don't foilar feed, I do however spray it with plain water a few times a day to help keep temps down. Baking soda is basic and will bring the pH up... I'm just not sure if it's safe to use in my res, it might even make the lockout worse.

NewGrow60sToker said:
Great MJ med problem link below. Lotsa pics and problems.

The Complete guide to Sick Plants,pH, and Pest troubles! - International Cannagraphic Magazine Forums

Hope it helps.
Click to expand...
Thanks for the link.
 
CANinBIZ

CANinBIZ

Well-Known Member
I had that on my plants and I was told to cut the infected leaves off and when I did the problem went away. I was told it was an air born fungus and I could see it on other plants around mine
 
bicycle racer

bicycle racer

Well-Known Member
disregard my comment on h202 effect on ph i just woke up. was not thinking clearly one thing though if you use h202 it will kill any helpful organisms(fungus bacteria etc..) your adding to your grow or are there naturally.
 
R

reeferMaster

Well-Known Member
i think you can burn the plants with plain water when the temps r 2 hot in the day time it magnifies through the water
 
armlengthbuds

armlengthbuds

Well-Known Member
dolomite lime powder will not only raise your ph to an even 7, but it also high in Mg and calcium. You can mix in water \(well) luke warm and love your pups with it! good luck!
 
G

gr33nz

Active Member
this might be a problem with your roots check them and if brown and wimpy get some h202 add 8 ml per gal
 
K

kalikushmaster

Active Member
so far i flushed the water changed it to a little less and im waiting if this does not work whats is this h202? cause my roots look a little brown but the rockswell is brown so idk more advice?
 
You must log in or register to reply here.
Top