Spotting, necrosis, lower leaves, spreading up. Help please.

[CapnKrash]

I have gone through the posts on the infirmary for self diagnosis.

From one of the flow charts and pics I THINK i might have cal/mag problems with this one.

First timer, indoors.

Space: 4x3 closet.

Lights: 600w LED 30" from tops 24/0

constantly moving air with fresh supply vented to outside. Oscillating fan to move air around.

SOIL happy frog soil, 25% perlite. In 3gal smart pots

Temps stays around 72-75 constantly now.

RH around 40-50%

WATER Tap with 50ppm and 7.1 - 7.8 ph. (tested with friends tds/ppm and ph meter before he moved)

NUTES Fed nutes @ 25% concentration, split a gallon across the 4 plants. (technaflora recipe for success) on 4/15. no foliar feeding.

Strain Royal Queen seeds, Northern lights. 18 days old from sprouting seed.

started: around 4/13, on the first set of leaves. I thought it was just the heat damage. Noticed it on a set of leaves further up on the 16th, and its spread across those leaves up to today. The first set of leaves have almost completely dried up and fallen off.

note in the first week while they only had one set of leaves they had two days where heat spiked to over 85 degrees with no venting and dry soil. This one was doing fine until this started. The others are doing fine, minus the obvious damage from the heat. None of them are showing this problem though. I have two strains, in the closet. Diesel berry from auto seeds and Royal Queen northern lights. The other NL is perfectly fine as far as I can tell.

I'm still new to this, I started a grow log a few years ago, but never completed it. This is my first solo grow since that one. I participated in a few friends grows to get better acquainted to the whole grow process before trying again. So technically still a first full grow...

You can see it here

Bugs? I have been all up and down these plants, through the soil, around the buckets in the grow room and I see zero evidence of insect activity. No smell of mold



The only way I have to measure PH is the meter you stick in the soil, and a chemical test kit.. but color vision problems make that test pretty difficult for me. The meter tells me the soil is constantly around 6.5-7ish

The one labeled NL 2-2 is from 4/26 when I noticed it had moved up to the next set of leaves. The rest are from today, you can see the spread.

Can I get a hand determining what this is, and how I treat it?

 

[CapnKrash]

guy I met at a grow shop let me borrow his meter, soil is 6.8 for ph. So I moved ahead as if it were cal/mag Fed it the recommended dosage of MagiCal. Crossing fingers

 

[HashMaster]

Might be more than just one thing... how's your phosphorus ?

 

[Waira]

hey Cap'n-- yes, I see the heat damage from earlier-- margins/"teeth" rolled up some,... so, have the necrotic spots gotten bigger, or have they stopped progressing by now? Oh, and what soil pH probe did you get to use? The skinny probe models you see at garden centers are worthless for accuracy, but something like the Accurate 8 is great, robustly built and plenty accurate! best of all, it's a direct measurement, not the dubious run-off method, which is prone to measurement errors... Grow parameters look good now -- I ask about progression still, because under heat/transpiration stress, the plants stomata close up, trying to prevent major water loss; this in turns slows the flow of water/nutrients way down from roots up, and can cause a temporary type of defc.,... it'd be fairly unusual for a plant your age, in good soil, okay pH (borderline, needs to get down into low 6's; over 7 and Fe will lock out fast), and with a shot of nute's to have a defc.'s, unless stressed like it was,... I'm leaning toward P defc. too (good call Hashmaster!), but Ca defc. can sometimes present in a similar manner, but usually with some finer spotting as well; P is mobile within the plant, meaning it can be translocated from older established tissues (usually from lower leaves) to new growth that needs it more; Ca is poorly mobile, so tends to hit higher up... Most important is the new growth looks fine! So, watch for symptom progression, letting that dose of nutes and improved environment do it's thing,... if it's still advancing after a day or two, let us know,...

 

[CapnKrash]

hey Cap'n-- yes, I see the heat damage from earlier-- margins/"teeth" rolled up some,... so, have the necrotic spots gotten bigger, or have they stopped progressing by now? Oh, and what soil pH probe did you get to use? The skinny probe models you see at garden centers are worthless for accuracy, but something like the Accurate 8 is great, robustly built and plenty accurate! best of all, it's a direct measurement, not the dubious run-off method, which is prone to measurement errors... Grow parameters look good now -- I ask about progression still, because under heat/transpiration stress, the plants stomata close up, trying to prevent major water loss; this in turns slows the flow of water/nutrients way down from roots up, and can cause a temporary type of defc.,... it'd be fairly unusual for a plant your age, in good soil, okay pH (borderline, needs to get down into low 6's; over 7 and Fe will lock out fast), and with a shot of nute's to have a defc.'s, unless stressed like it was,... I'm leaning toward P defc. too (good call Hashmaster!), but Ca defc. can sometimes present in a similar manner, but usually with some finer spotting as well; P is mobile within the plant, meaning it can be translocated from older established tissues (usually from lower leaves) to new growth that needs it more; Ca is poorly mobile, so tends to hit higher up... Most important is the new growth looks fine! So, watch for symptom progression, letting that dose of nutes and improved environment do it's thing,... if it's still advancing after a day or two, let us know,...

Yes, the spots are still advancing, it seems to have slowed down but it is advancing. The plant is 20 days old as of today. The heat damage happened within the first 5 days of sprouting and has been watered twice since. Once with the 25% nutrient solution, and the other day with magical. The plant has actually grown significantly since those few days of heat/dry. This is the only thing going on. It seems it might have started on my other northern lights, I looked in this morning and there were a couple spots on the lowest leaves of that one.

Assuming it is P deficient how do I fix it? They just need a feeding? If that's so, the technaflora kit says I feed-water-water-feed to avoid salt build up. Do I flush, then feed, or am I safe in just feeding since it was a 25% solution, mixed with a gallon spread across all 4 plants?


the meter I was using was some unbranded soil probe and PH pen the guy let me borrow. Both tests showed PH is fine.

Thanks for the help!!

 

[CapnKrash]

Ok it helps if I read, but: All I have is technaflora recipe for success kit. The question above does still hold true though. Do i flush first, then feed? Do I have to worry about overwatering? Its been a few days and the soil is dry to first knuckle, but the pot is still 'heavy' compared to the other 4 due to the cal/mag i gave it. Or could we assume I may have just underfed?

The reason they got too dry was because I was paranoid of overwatering, until a friend pointed out the pots are way too dry. I'm pretty paranoid of over-doing anything, i think to the point of actually under-doing things lol.

 

[Bromeo]

Ok it helps if I read, but: All I have is technaflora recipe for success kit. The question above does still hold true though. Do i flush first, then feed? Do I have to worry about overwatering? Its been a few days and the soil is dry to first knuckle, but the pot is still 'heavy' compared to the other 4 due to the cal/mag i gave it. Or could we assume I may have just underfed?

The reason they got too dry was because I was paranoid of overwatering, until a friend pointed out the pots are way too dry. I'm pretty paranoid of over-doing anything, i think to the point of actually under-doing things lol.

Flush then feed. Even if it's "heavy" it's still heavy with whatever nutrient(s) that are causing the problem. Go ahead and flush and resume your feeding schedule.

 

[Trypsy Summers]

I had the same ish, with a recent plant (non auto) in the end I just went with flush, and left it to its own devices, by that I mean I fed it very weak ferts, (after the flush) and just waited until all the fan leaves had shriveled and really died back, then I removed them, the buds are coming along now, and the plant is recovering, but still looks shook! As for the problem, I don't know as to the actual cause, as I've got one other plant acting this way, but the rest are fine, I don't know if it's an (inadvertent) nute build up or what!

But I'm monitoring it. The trick is not to panic and go overboard!

Not saying, just saying, without saying!

 

[CapnKrash]

Flush then feed. Even if it's "heavy" it's still heavy with whatever nutrient(s) that are causing the problem. Go ahead and flush and resume your feeding schedule.

Thanks, I did that the day you suggested it. I flushed with ph 7.0 water and found the runoff was coming out 5.5 so acid soil. I top fed with dolomite lime and gave her weak nutes. The spots are still pretty bad, but it seems to have stopped. She has grown some as you can see in the comparison pictures below. Labeled day 21 and 24 respectively. Day 21 was the day of flushing/feeding. As well as feeding the rest. NL-2 is the plant in question.

I had the same ish, with a recent plant (non auto) in the end I just went with flush, and left it to its own devices, by that I mean I fed it very weak ferts, (after the flush) and just waited until all the fan leaves had shriveled and really died back, then I removed them, the buds are coming along now, and the plant is recovering, but still looks shook! As for the problem, I don't know as to the actual cause, as I've got one other plant acting this way, but the rest are fine, I don't know if it's an (inadvertent) nute build up or what!

But I'm monitoring it. The trick is not to panic and go overboard!

Not saying, just saying, without saying!

Yeah the one thing I've been trying to keep in mind is to just kinda let them do their thing. I don't want to helicopter parent them, or overdo anything. Just following the schedule, and watering when they need it. Otherwise just letting them be. I was involved in a few grows since my uncompleted one and that is one of the big things I took from them.

What you say about yours recovering makes me feel confident of mine though, so thank you for that! I think besides a few hiccups things are going well enough :smoking:

 

[Bromeo]

They look young still. They should be fine. Maintain balanced ph as bast you can. I've been growing 4 years and probably have 100s of plants under my belt and still I struggle with ph daily.