Hi all,

two plants in my scrog have developed a yellowing in the elder leaves, spreading kind of from the middle upwards.

The yellowing then gets black spots appearing on the tops of the leaves.

genetics are oldtimers haze, dont suspect environment as its only 2 plants.

Heres a few pictures

and another

and a third, this time using a diff filter.

Something fungal??

I don't think the whole leaf would turn yellow like that if it was fungal, i could be wrong (and probably am).

na im with u on that, ud think surely there would at least be black spots on some healthy leaves, and there arent.

nexy best guess, perhaps it wants N and MG badly?

maybe, those spots are weird though? do they only get those necrotic patches after they've proper yellowed? could just be food shortage, then the tissue eventually dying off causing the spots.. no expert though just an idea

ay scrag, could be.

THere is some spotting soon after the leaf starts to yellow, then its becomes more pronounced as the leaf dies.

Seems to be in two of the biggest plants.

gave them a massive feed on last watering in case this was the case, extra bloom and grow, and some epson salts.

last feed was yesterday, so i guess we see if it makes the difference in a few days.

definatly spreading.....


Im mixing up some trichoderma tonight and spraying, just in case..

For further information, i was currently feedin at 3ml bloom 1ml grow per liter, upped it to 4 ml bloom, 1.5 ml grow for last feed, added epsom salts.

Plants under 1000W light, with a 300mm RVK for every 1000W light, temps are fine, extraction is good.

Yellowing seem to occur with blotches, i have also found spots which look like "rust mold" of some variety.

The yellowing looks like hunger, especially N and then when leaves die they are easy prey for mould and fungal probs, yet the clawing leaves look like theyve been overfed?

There definitely something wrong aswell cos the plants look really droopy and sad, as if they were in a bad environment, but you say thats fine



Trichoderma will help but also should be sprayed to prevent this

I spray mine when they are just rooted then again just before they go in flower

I rarely suffer with fungal probs but have had a touch towards the end of this grow, also had a bit of budrot too

Like OT says theres now 100's of different fungal spores that is latching on to cannabis, many showing as rust patches

Its a big problem especially now the wet weather is setting in

Sorry i cant be more precise

Many thanks owd, i appreciate the second opinion, hopefully then, we are allready on the right road to recovery.

I'd say you were giving them too much Bloom & not enough Grow. How many days into 12/12 are they?

day 93.

i gotta say it looks a touch fungal to me mate,

what are your lights off temps, and lights off humidity?

Hi pimp,

Any little white flies buzzing around now or in the past on this grow.

As others may have said rustspot/fungal, or maybe white fly infection?

Not sure if you have said this or not ho much water are you giving them per day?

Sorry i cannot be of any use as i dont grow in soil.

However, i really hope you get this one sorted mate am sending lots of karma you way ..


ATB


SS

Cheers for the karma mate, and many thanks to bish.

I have fed today at 2mlgrow 2ml bloom per liter, have sprayed with trichoderma mollassus mix.

Lets hope she looks well tomorrow.

i think you should maybe drop the bloom along with upping the grow, ratio's i find are usually more important than quantity. i.e. if you give them more phosphorous, then they need more nitrogen to process this, so if you're suffering an N def, upping both the P and the N, then you're still lacking in N

ah... never mind then!

Hey PIMP,

Looks very much like manganese def. Are the brown spots mainly on the younger leaves, and are the veins still green on the yellowing leaves? Could be due to low pH in the soil, manganese gets locked out below 5.0. Try foliar feeding with a fertiliser containing Mn.

Mook

Mook?

Where the hell did you get that answer?

Firstly, i gave pictures, please circle one leaf showing interveinal chlorisos?

Show me one leaf with brown spots on the younger leaves?

All you seem to have done is posted up what a manganese defeciency is, without looking at my pictures, or reading my description.

I know you are only trying to help, but that is some really really bad advice there bro, and if i was a noob, could have had me foliar feeding my plants when they are 80% through budding.

Read peoples posts very carefulyl in this fourm mate, and then dont answer unless you know your stuff for certain.


As for the rest of you who helped, the N feed looks like its doing its stuff, ill post update pictures tonight.

OK some pictures of the few sick plants here.

Getting better imo.

Thinking of upping the feed to 4:1 gr:bl for the next feed .

Just replied to your diary

See how they go before upping the Grow anymore!

hehe nice one bish, ill see how it goes .

Few update pics.

still feeding at 3:1Click to view attachment

and another

pictures can see what my hopeful eyes cant, the necrotic spots are increasing in size and frequency and the yellowing continues, although is a lot slower.

I will up the feed to 4:1 on the next feed unless they show more improvement, or anyone else has an idea.

Hmmm, definately something not quite right Doesn't look like a lack of N though so feeding more i dont think is going to do too much. I have a similar on going problem with my grow and ive just assumed its fungal. Ive tried regular Essence sparys but its still ongoing (although not as bad) so i cant really say thats definately it. Have you given OT1 a poke yet?

Have now nausicca.

dunno, it looks like brown blight though

Hello.

I have had these same yellow leaves with dark patches for the last 3 grows. The first time it happened I was growing in coco and the last 2 I changed to hydro. The last grow was in a different house with a lower ph water supply but still using Canna Aqua Vega & Flores nutrients. The last grow was using a new strain too, yet still the same problem.

Good luck mate.

Hello guys,

Just wondering if this thread has been ditched/moved or something??

I've a plant with rusts spots and leaf curl so thought I'd poach some tips from this thread if that's o.k.

-A-

I'm no expert Pimp, but have you tested the PH of your grow medium?
Maybe compare it against other plants that arent exhibiting the same problems?
If your PH is out of kilter it doesn't matter how much N you throw at it... the plant will struggle to take it up.
It could maybe explain the underfert/overfert sysmtoms, as different nutrients will get locked out as the PH slides one way or another. Hence the plant may still be able to take up all the potassium to the point of exhibiting over feeding, yet the nitrogen gets totally locked out and the leaf shows the yellowing on lack of N at the same time.

Just a stab in the dark Pimp, but at least you could rule it out if you can test your grow medium and compare against others that arent showing the same issues..
Finga's X'ed for ya bud....

Just to update here, Oldtimer advised that i had a root infection, treating the root masses of the plants with trichoderma stopped the yellowing.

However i am still fighting the fungal infection that was able to take hold during the N Def.