Please help! Plant yellowing rapidly after fungus gnats/neem/DE!

SMELLLLL

Member
Hello!

A bit of a newbie here, this is my first indoor plant. She's at about ~12 weeks of veg, and I'm wanting to flip her to flower pretty soon. Recently I had a fairly bad infestation of fungus gnats (stupidly thought that leaving my cuttings on the surface of the substrate to breakdown would be a good idea - became a breeding grown pretty quick!), and so went through control measures of sticky cards, drenching the substrate with eco-neem, and top dressing about ~3cm of diatomaceous earth to suffocate the larvae. I've got the fungus gnats under control now, but my plant has started showing some serious signs of stress over the last week, just after the above control methods.

A quick background of what I'm working with:
Growing in Organic Coco Coir, in a 28 liter pot, mixed ~80grams of Biogrow fertiliser into the substrate (I have been told time and time again that shit fertiliser works as a slow release even in coco coir. I water every night, about 2 litres, add worm piss (mixed at a 1:10 ratio) once a fortnight, and humic acids + seaweed extract probably 2-3 times a week. Growing in a 1.2 x 1.2 (4ft) tent, with a 315w CMH.

I have a daily watering/feeding/EC/pH diary going back about a month and a half. EC varies/averages around .9 - 1.5 most days, pH is around 7.

Does anyone have any suggestions of how to get my leaves back looking that deep green? Really hope I haven't damaged her irreparably. All suggestions welcome.

Thank you.

DE.jpgDE2.jpgDE1.jpgDE3.jpg
 

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myke

Well-Known Member
Shes starving,Im not sure about the DE maybe remove,she needs a good flush with food and calmag.Organic coco just doesn't work i think.Treat it like reg coco, water to runoff every day with food and Ca/Mg.
Raise the light also,looks bleached from too much.
 

Bernie420

Well-Known Member
Hello!

A bit of a newbie here, this is my first indoor plant. She's at about ~12 weeks of veg, and I'm wanting to flip her to flower pretty soon. Recently I had a fairly bad infestation of fungus gnats (stupidly thought that leaving my cuttings on the surface of the substrate to breakdown would be a good idea - became a breeding grown pretty quick!), and so went through control measures of sticky cards, drenching the substrate with eco-neem, and top dressing about ~3cm of diatomaceous earth to suffocate the larvae. I've got the fungus gnats under control now, but my plant has started showing some serious signs of stress over the last week, just after the above control methods.

A quick background of what I'm working with:
Growing in Organic Coco Coir, in a 28 liter pot, mixed ~80grams of Biogrow fertiliser into the substrate (I have been told time and time again that shit fertiliser works as a slow release even in coco coir. I water every night, about 2 litres, add worm piss (mixed at a 1:10 ratio) once a fortnight, and humic acids + seaweed extract probably 2-3 times a week. Growing in a 1.2 x 1.2 (4ft) tent, with a 315w CMH.

I have a daily watering/feeding/EC/pH diary going back about a month and a half. EC varies/averages around .9 - 1.5 most days, pH is around 7.

Does anyone have any suggestions of how to get my leaves back looking that deep green? Really hope I haven't damaged her irreparably. All suggestions welcome.

Thank you.

View attachment 4697450View attachment 4697451View attachment 4697452View attachment 4697453
I agree with above poster that you should raise the light some.
Best thing to do when you have an issue is to raise the light and slow the grow and let them recover.
Looks like it could use some epsom salt and add microbes.
use the humic and kelp once a week three times seems like its too much of a good thing. Stop the kelp week 2 of flower.

What you probably did was choked out your roots with the neem, depending on how much you added, its an oil and it coats things.
 

SMELLLLL

Member
Myke and Bernie, thanks for your replies.

When you say flush with food and Ca/Meg, can you explain this a little? Any chance you can suggest some products that might work? I’m in Australia but can speak to a hydro store about some similar products.

I thought ‘flushing’ was simply flushing the substrate with water, to potentially rid the substrate of any salts/fertiliser residue/chemical (neem) residue etc. Are you saying this flush should actually contain fertiliser / calmeg?

Also, i am definitely utilising a drain to waste system. approx 1/4 of what i water with comes out in run off.

Cheers
 

myke

Well-Known Member
Myke and Bernie, thanks for your replies.

When you say flush with food and Ca/Meg, can you explain this a little? Any chance you can suggest some products that might work? I’m in Australia but can speak to a hydro store about some similar products.

I thought ‘flushing’ was simply flushing the substrate with water, to potentially rid the substrate of any salts/fertiliser residue/chemical (neem) residue etc. Are you saying this flush should actually contain fertiliser / calmeg?

Also, i am definitely utilising a drain to waste system. approx 1/4 of what i water with comes out in run off.

Cheers
Ok,thought you weren't getting runoff.So maybe not a food issue.Sure looks like light bleaching or not enough N or Mg.Have no experience with the neem thing.
But your pH u say 7? Should be 5.8 ish.
 

ilovetoskiatalta

Well-Known Member
Hello!

A bit of a newbie here, this is my first indoor plant. She's at about ~12 weeks of veg, and I'm wanting to flip her to flower pretty soon. Recently I had a fairly bad infestation of fungus gnats (stupidly thought that leaving my cuttings on the surface of the substrate to breakdown would be a good idea - became a breeding grown pretty quick!), and so went through control measures of sticky cards, drenching the substrate with eco-neem, and top dressing about ~3cm of diatomaceous earth to suffocate the larvae. I've got the fungus gnats under control now, but my plant has started showing some serious signs of stress over the last week, just after the above control methods.

A quick background of what I'm working with:
Growing in Organic Coco Coir, in a 28 liter pot, mixed ~80grams of Biogrow fertiliser into the substrate (I have been told time and time again that shit fertiliser works as a slow release even in coco coir. I water every night, about 2 litres, add worm piss (mixed at a 1:10 ratio) once a fortnight, and humic acids + seaweed extract probably 2-3 times a week. Growing in a 1.2 x 1.2 (4ft) tent, with a 315w CMH.

I have a daily watering/feeding/EC/pH diary going back about a month and a half. EC varies/averages around .9 - 1.5 most days, pH is around 7.

Does anyone have any suggestions of how to get my leaves back looking that deep green? Really hope I haven't damaged her irreparably. All suggestions welcome.

Thank you.

View attachment 4697450View attachment 4697451View attachment 4697452View attachment 4697453
@SMELLLLL h2o2 diluted is great for fungus gnats. The 315cmh has a broader spectrum and requires cal/mag to facilitate uptake. If you are running the hortilux 315 with more UV then the cal/mag is something I have found helps. I run a mix of dry amendments and I use liquid fertilizers together(FF trio, AN grow grow big and bud candy. I have seen very good results with AN cal/mag(yes I have tried others and this is not a plug).
Going back to the fungus gnats, since you are still in veg letting the soil dry to a wilt and then adding the h2o2 diluted has a greater impact on the gnat larvae in my experience.
 

Bushbaby11

Well-Known Member
Hello!

A bit of a newbie here, this is my first indoor plant. She's at about ~12 weeks of veg, and I'm wanting to flip her to flower pretty soon. Recently I had a fairly bad infestation of fungus gnats (stupidly thought that leaving my cuttings on the surface of the substrate to breakdown would be a good idea - became a breeding grown pretty quick!), and so went through control measures of sticky cards, drenching the substrate with eco-neem, and top dressing about ~3cm of diatomaceous earth to suffocate the larvae. I've got the fungus gnats under control now, but my plant has started showing some serious signs of stress over the last week, just after the above control methods.

A quick background of what I'm working with:
Growing in Organic Coco Coir, in a 28 liter pot, mixed ~80grams of Biogrow fertiliser into the substrate (I have been told time and time again that shit fertiliser works as a slow release even in coco coir. I water every night, about 2 litres, add worm piss (mixed at a 1:10 ratio) once a fortnight, and humic acids + seaweed extract probably 2-3 times a week. Growing in a 1.2 x 1.2 (4ft) tent, with a 315w CMH.

I have a daily watering/feeding/EC/pH diary going back about a month and a half. EC varies/averages around .9 - 1.5 most days, pH is around 7.

Does anyone have any suggestions of how to get my leaves back looking that deep green? Really hope I haven't damaged her irreparably. All suggestions welcome.

Thank you.

View attachment 4697450View attachment 4697451View attachment 4697452View attachment 4697453
12 weeks of veg!!?? She's hungry!!! Lacking nitrogen (light leaves) need to be green!
 

Bernie420

Well-Known Member
Myke and Bernie, thanks for your replies.

When you say flush with food and Ca/Meg, can you explain this a little? Any chance you can suggest some products that might work? I’m in Australia but can speak to a hydro store about some similar products.

I thought ‘flushing’ was simply flushing the substrate with water, to potentially rid the substrate of any salts/fertiliser residue/chemical (neem) residue etc. Are you saying this flush should actually contain fertiliser / calmeg?

Also, i am definitely utilising a drain to waste system. approx 1/4 of what i water with comes out in run off.

Cheers
no just flush with water then renute right afterwards...add epsom add microbes.
 

SMELLLLL

Member
Thanks all for your responses.

I bought a container of this liquid nutrient mix from my local hydro store, which should hopefully help the cal/mag and nitrogen problems. I'm going to start feeding her every day with this until she turns a much darker green, then I will flip to flower.

Hoping this works, will report back in a week or so.
 

TintEastwood

Well-Known Member
PH. PH affects uptake of nutrients. Coco normally 5.8 thru 6.1. You have a unique hybrid coco dealio.

Check the media PH if possible, or runoff PH.

hydroponics-ph-chart-marijuana.jpgsoil-ph-chart-marijuana.jpg



Coco college


Gnats. Replace the de with crushed up mosquito dunks. Every feed distributes bti.
 

SMELLLLL

Member
This new liquid fert reduces the pH, I just tested and pH was around 5.8, so I’ve now got that under control too.

Also increased the height of the light ~6cm so hopefully no more burn.
 
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