I could use some help with diagnosis

[ramse]

The plants are 4 weeks old. A few days ago I transplanted them into 11 liter pots waiting for them to show sex--then they will go into raised beds/mounds. However the day after transplanting I had a physical problem that prevented me from seeing the plants for a couple of days. So I didn't see how the symptoms started and progressed....
they were in full health and within three days I found them like this:

I didn't notice any mites, insects, etc.

 

[ramse]

 

[Growenhaft]

hallo
solche schäden können nach dem umtopfen auftreten. normalerweise, wenn der boden beim umtopfen sehr trocken ist... die an den wurzeln, wohlgemerkt..
die alte trockene erde im kleinen topf kann das wasser dann nicht so gut aufnehmen. wenn es dann nach dem umtopfen in einem großen topf ist und sie nicht wirklich reich und über mehrere stufen gießen, bleibt der alte boden trocken und wird von nasser erde bedeckt. so haben sie dann 2 zonen in ihrem topf... eine trockene an den wurzeln und eine sehr nasse ohne wurzeln.
cannabiswurzeln machen diesen schritt in der regel nicht. sie haben ein problem, aus einem trocknungsbereich in einen feuchten bereich zu wachsen ... und umgekehrt.

wenn ja... dann sollten sie langsam den bereich gießen, in dem die alte erde bedeckt ist... bringen sie ihr medium in den topf bei gleichmäßiger feuchtigkeitsdurchdringung. andernfalls werden weitere informationen benötigt. aber der schaden wäre charakteristisch für spannungen im wurzelbereich... zeigen aber auch auswirkungen von insekten.

sie müssen die mädchen nicht fesseln... sie rennen nicht weg. ist dies als unterstützung gedacht, steht es einer gesunden entwicklung der sorte im weg... die anlage muss sich in diesem stadion selbst tragen können... nur so kann sich die festigkeit des rumpfes an das wachstum anpassen.

 

[ramse]

I also have other plants of the same age, in 2 liter pots, which are still in the greenhouse and have received the same treatment but show no symptoms... only the plants that have been transplanted have this problem. I used the same soil for the transplant. I'm speculating it's not an abiotic problem, nutrient or soil... but biotic... although I haven't seen any signs of parasites.

 

[40degsouth]

Hey ramse,
they actually don’t look that bad to me because it’s only at the tips and on the odd finger of a leaf or two, it could be a difference in light intensity, from being moved from inside to outside or a bit of a frost or really cold snap because one leaf looks like a bit of shot damage from hail. It could also be from grabbing the leaf to hard but that one’s a bit of a long shot.
The leaves of the very last photo look like they might be starting a touch of leaf spot though. I don’t want to alarm you but if those little yellow spots get bigger, I’d be a lot more worried about that than anything else.
Pretty difficult to diagnose something like that but if it was nutrient burn I’d expect to see it on every leaf. You could always flush with fresh water, one third the volume of soil from memory, just to be sure.
I hope this helps you out ramses, let us know how you go,
Cheers,
40.

 

[goingrey]

Might a caterpillar have had a taste?

 

[revegeta666]

Hi. You don't say if you measure your water pH. If you don't, I would think this is the cause. The rusty burnt spots usually appear when there's a sudden pH imbalance. Change in soil pH from rain could also be a reason.

 

[ramse]

ph water: 6,5-7

 

[40degsouth]

Forgot to say, it could be from a foliar spray too.
40

 

[Creeperpark]

It's caused by too high of an EC from the extra soil. When you water you release extra nutrients in the new extra soil during transplanting. Keep the watering to a minimum until the plant establishes its new root system. If you overwater at this point you will burn the shit out of your plants.

 

[moses wellfleet]

It could be foliar spray all right… did a dog have access to the plants and lift his leg?

The random manner of the damage suggests such.

 

[med4u]

Looks like some wildlife has taken a nibble.....
Cats and other animals saliva can be very
Toxic to plants....it looks like they were not overly impressed with your genetics...a good thing lol
You may try a spray of diluted lemon juice or vinigar to keep the rascals away...
Good luck

Are you using pine needles or grass for a mulch?

 

[troutman]

Slugs come out at night.

 

[TanzanianMagic]

View attachment 18712377

The plants look great. They most likely are close to having to repot.

The leaf damage looks like either phosphorus deficiency/lockout, or calcium.

There are also some small dots on the leaves, which indicates some insect damage, which is not surprising outdoors in nature.

However the tops look great (no high pH issues) and the leaves are nice and green.

Repotting seems to be the best solution. The minimum is 1 gallon per expected foot of growth.

 

[ramse]

And here we go again...
the problem manifests itself only on the older leaves starting at the bottom. Symptoms begin with mild necrosis of the tips or edges and interveinal chlorosis starting with a "cloud" pattern"... some leaves show dark and dry necrosis, which makes me think of a problem with phosphorus, see last photo.

plant in 250 gal bed

 

[ramse]

symptom progression

second photo after 36 h

 

[Maple_Flail]

looks to me like either phosphorus excess or sulfur excess accompanied by a Magnesium/manganese deficiency

could be lock out causing the excess.. hard to tell.

 

[jackspratt61]

Do you have pic of entire plant?

 

[troutman]

Initially, your pH went up to 7. Never allow it to go higher than 6.5 to reduce the chances
of some trace elements like iron and manganese being locked out. A range of 6.2 to 6.5 in
soil is nice. Without knowing more I would give the plants a little epsom salt, cal/mag and
a fertilizer with equal nutrients like 7-7-7 to cover all bases. Throwing a few rusty nails in
your watering reservoir in increase iron levels won't hurt. You could also try feeding some
plants more nutrients than the others to see if they recover before trying all of them.

 

[ramse]

tomorrow I will take a full picture... however the new growth is healthy. Symptoms progress from bottom to top, manifesting in older leaves.

I have pruned some old affected leaves and this only seems to have increased the progression of chlorosis and necrosis in the leaf soon after