Mephisto auto grow. Organic. Yellow leaves and rust spots

mlore · Jun 12, 2020

Hi people,

It has been a very long time since I’ve posted.Hope everyone is good.

just started back up again and I’m running into a few problems about 3 weeks into flowering

a few of my plants are starting to display yellow leaves and are fading to a light green. Mainly on my orange diesel and 3 bears og. Also on the og, leaf edges are going yellow. And today I noticed that I have some rust spots on my forum stompers and sour livers.

I’m not to sure what the problem is? I’ve been scouring the internet but can’t seem to find the definite problem.
I thought maybe nitrogen but I’ve been feeding fish mix by bio bizz at about 2 ml a litre and upped it to 3ml last watering just in case but can’t see any change. I also added atiny bit of cal mag bio bizz just in case for the rust spots. But to be honest itnow looks worse.

Orange diesel, forum stomper, 2 bears og, sour livers
room temp 23-29c
RH 40-55
Light distance 17-22 inches
soil bio bizz light mix
Nutrient line bio bizz grow and bloom at 3ml and 4 ml a litre. Guanokalong taste enhancer and I added pk 4/8 By plant magic old timers at 1ml a litre about a week ago for 2 waterings running. I have now cut it out thinking it could be the problem but nothing has changed
I haven’t PHed as I’ve been told by many many people you don’t need to with organic. But am seriously contemplating it as I have no idea what the problem is.
I’ve got a full line of nutes and everything else seems spot on.
Anyway. I hope you managed to read it all. Any help is much appreciated.
Thanks

TreeFarmerCharlie · Jun 12, 2020

Looks like a lot of heat stress in the first picture. What are you running for lights and how close are they to the plants?

HolyAngel · Jun 12, 2020

I'm also seeing mag lock out and too much nitrogen on that bottom left plant in the first pic. Calcium and/or Mag deficiencies on the next 4 or so.. The last two pics those plants have a lot of nitrogen too, so could be nute lockout on those as for whats causing the yellowing edges. I have zero knowledge on your nutes and soil though so I can't be of any help in that department :/

mlore · Jun 16, 2020

HolyAngel said:
I'm also seeing mag lock out and too much nitrogen on that bottom left plant in the first pic. Calcium and/or Mag deficiencies on the next 4 or so.. The last two pics those plants have a lot of nitrogen too, so could be nute lockout on those as for whats causing the yellowing edges. I have zero knowledge on your nutes and soil though so I can't be of any help in that department :/

I’ve actually been really careful on the nutes and not fed over 3ml a litre

last few waterings I’ve uppedthe bloom to 4ml a litre and dropped the grow to 2ml also added some organic cal mag. There has been no improvement and seems like it’s getting worse.
Il try and upload some more pics soon

mlore · Jun 16, 2020

TreeFarmerCharlie said:
Looks like a lot of heat stress in the first picture. What are you running for lights and how close are they to the plants?

I know one has got heat stress. For some reason it’s really sensitive compared to the others.
I’m running two 600 hps and they are 17-22 inches from the canopy

Mephisto auto grow. Organic. Yellow leaves and rust spots

mlore

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