need help /advice bottom leaves turning yellow tips drying and dying curling up

[ComfortablyNumb]

i will start ph at 6.3 from now on

I have a chart somewhere that shows the optimal uptake pH for a list of nutes. I'll try and find it and post it here.

 

[biggerbud420]

I have a chart somewhere that shows the optimal uptake pH for a list of nutes. I'll try and find it and post it here.

i believe ya i guess i just been reading it wrong for a whole year

 

[ComfortablyNumb]

I did not find the chart yet, but I found his explanation for the 6.3 "At 6.5 the trace element uptake suffers which causes certain chemical reactions to suffer and you get a substandard plant."
So, it could be most say 6.5 and he has this specific reason for choosing 6.3
I leave it to you to decide.

 

[KushNAshn]

to me this is what my leaves look like View attachment 1134757

Been chasing this deficiency for a month running two organic pesticides + a lazy error on my part. My gut feeling tells me pests particularly fungus gnats and their larvae eating certain roots.

2nd run and decided on tossing my first after a 4+ month veg of massive learning curve. Had root aphids which had done too much damage + fungus gnats. I believe I have observed the difference in the damages they both do.

I'm having the same issue as you on this run and my environment is perfect, ph in and out is good. Ppms are good. Only thing that wasn't good was how aggressive I went on IPM and slacked after I thought problem was cleared.


Before the leaves got this bad the few originally started out exactly how yours look. Then as it progressed the plants started either giving one deficiency or many defiencies all on one plant. On select plants they were hardly affected but almost show one similar thing.

 

[Aqua Man]

Been chasing this deficiency for a month running two organic pesticides + a lazy error on my part. My gut feeling tells me pests particularly fungus gnats and their larvae eating certain roots.

2nd run and decided on tossing my first after a 4+ month veg of massive learning curve. Had root aphids which had done too much damage + fungus gnats. I believe I have observed the difference in the damages they both do.

I'm having the same issue as you on this run and my environment is perfect, ph in and out is good. Ppms are good. Only thing that wasn't good was how aggressive I went on IPM and slacked after I thought problem was cleared.


Before the leaves got this bad the few originally started out exactly how yours look. Then as it progressed the plants started either giving one deficiency or many defiencies all on one plant. On select plants they were hardly affected but almost show one similar thing.

Underwatering and maybe a cold rootzone.

 

[Aqua Man]

Imo you don't need to both ph adjusting your nutrients for a buffered soil grow.

The soil will adjust the PH. It's the whole reason it's buffered. You can adjust you feed PH all you want once you add it to the soil it will be impacted and changed according to how the soil is buffered.

Plants... cannabis included grow in a fairly wide range of ph. The plants and microbes can adjust the ph of the soul to thiwr needs... to a certain extent.

What plants don't like is big PH swings.

How many of you PH you water for your garden? Nope no need again because the soil is ALREAADY buffered.

If you have a PH problem in soil it because of something other than PH you nutrients... and if you need to correct PH in soilnit should be done with amendments not you nutrient feed

 

[KushNAshn]

Underwatering and maybe a cold rootzone.

Interesting. As last run I probably overwated a tad. So this run I went the opposite route and would wait till droopy + been trying to get the fungus gnats a less ideal environment.

Interesting as I'm 90% certain all my issues are fungus gnat larvae eating the roots.

 

[Aqua Man]

Interesting. As last run I probably overwated a tad. So this run I went the opposite route and would wait till droopy + been trying to get the fungus gnats a less ideal environment.

Interesting as I'm 90% certain all my issues are fungus gnat larvae eating the roots.

Toss some BTI in with the watering or crush and put on top of the soil. Add yellow sticky traps to catch the adults.

 

[SDJ99]

Toss some BTI in with the watering or crush and put on top of the soil. Add yellow sticky traps to catch the adults.

What’s BTI? I am also having fungus gnat issues with ALL my houseplants

 

[biggerbud420]

i have only been growing for a year my last grow was the same kush and afghan strain i thought was doing pretty good these plants are looking better and bigger then my last grow

Imo you don't need to both ph adjusting your nutrients for a buffered soil grow.

The soil will adjust the PH. It's the whole reason it's buffered. You can adjust you feed PH all you want once you add it to the soil it will be impacted and changed according to how the soil is buffered.

Plants... cannabis included grow in a fairly wide range of ph. The plants and microbes can adjust the ph of the soul to thiwr needs... to a certain extent.

What plants don't like is big PH swings.

How many of you PH you water for your garden? Nope no need again because the soil is ALREAADY buffered.

If you have a PH problem in soil it because of something other than PH you nutrients... and if you need to correct PH in soilnit should be done with amendments not you nutrient feed

that pro mix im using has ground limestone in it for ph adjustment do i need to be adjusting my ph ?

INGREDIENTS​

• Sphagnum peat moss (80-90% by volume)
• Coir
• Perlite
• Ground Limestone (for pH adjustment)
• Wetting agent
• Mycorrhizae

 

[Aqua Man]

It's a bacteria so completely organic. Mosquitoe dunks are BTi.

Bacillus thuringiensis israelensis - Wikipedia

en.m.wikipedia.org

Sold in a few different forms and available many places... home depot, Canadian tire, prob Walmart and most hardware or garden stores.

Bacillus thuringiensis israelensis (Bti) Mosquito Control

A bio-rational control, Bacillus thuringiensis israelensis (Bti) is present naturally and controls the larval stage of certain Dipterans – mosquitoes, fungus gnats, and black fly. It has been used as a natural control measure since the 1960's by backyard gardeners and commercial growers alike...

www.arbico-organics.com

 

[ComfortablyNumb]

You can also go with one of my favorite answers: fungus gnats breed in the wet soil, so you need to let the soil dry out a bit.
Look at your plant. Which way are the leaves pointing? If they are pointing up towards the lights, that is good. That's when you water for organic soil.
If they are pointing down they have too much or not enough water. The way to tell is to feel the leaves? Are they dry and crumbly or soft and flexible?
Another option for FG's is Lost Coast Plant Therapy. It is organic and you can use it almost to harvest.

 

[Aqua Man]

You can also go with one of my favorite answers: fungus gnats breed in the wet soil, so you need to let the soil dry out a bit.
Look at your plant. Which way are the leaves pointing? If they are pointing up towards the lights, that is good. That's when you water for organic soil.
If they are pointing down they have too much or not enough water. The way to tell is to feel the leaves? Are they dry and crumbly or soft and flexible?
Another option for FG's is Lost Coast Plant Therapy. It is organic and you can use it almost to harvest.

Won't kill the larvae

 

[Aqua Man]

i have only been growing for a year my last grow was the same kush and afghan strain i thought was doing pretty good these plants are looking better and bigger then my last grow

that pro mix im using has ground limestone in it for ph adjustment do i need to be adjusting my ph ?

INGREDIENTS​

• Sphagnum peat moss (80-90% by volume)
• Coir
• Perlite
• Ground Limestone (for pH adjustment)
• Wetting agent
• Mycorrhizae

Nope that's whybit has limestone and peat... thise 2 create the PH buffer. Like I said previously PH adjusting you feed is only really for inert media with no buffers.

Read here.

Marijuana pH Levels for Growing Weed: A Basic Explanation

In this article, we discuss proper pH levels for your weed plants; alkalinity, soil pH, tap water, and the effects of nutrients on pH when growing marijuana

www.thcfarmer.com

 

[ComfortablyNumb]

Won't kill the larvae

I never had that problem because we work it (till) into the top inch which is where they breed at.

 

[biggerbud420]

i had fungus gnats on my last grow i used these and it got rid of all of them

 

[Aqua Man]

I never had that problem because we work it (till) into the top inch which is where they breed at.

They will also invade the holes in the bottom.

 

[biggerbud420]

ok thanks

 

[Aqua Man]

i had fungus gnats on my last grow i used these and it got rid of all of them View attachment 1135500

Nematodes will work but there are some better than others... im not sure which I am not much of a bug guy. Never had an issue myself but have treated them at a buddies once.

 

[ComfortablyNumb]

They will also invade the holes in the bottom.

We had them bad. so we got the stuff and tried it. 75% of the critters were gone after the first treatment. 2 more treatments and we haven't seen one since. My wife sprays the soil and then tills it in. We use fabric pots so them entering the drain holes was never an issue.