[issack]

This happened on my last run. Plant will start yellowing super fast and within 2 days it just dies. This is with pineapple chunk. I had to pull early last run cause about 4 plants died and one was all the way in the back and impossible to extract.
I'm thinking heat stress.? My temps are kinda high. 85 86 with co2. But above the canopy I'm sure it's hotter. This is at 36 days flower. The mountain apple OG on the left you can see the leaves starting to yellow where the hot spot is from the light. And the pineapple chunk on the right there is hardly any yellow leaves. I have a 18k mini split running now for 8k of lights .. and a 36k btu in the box waiting to go in for the next run.. So will a plant just up and die in a matter of 24 hours due to heat stress.? There is no burnt curled leaves anywhere. Idk the only thing I can think is heat stress. And when the leaves start to yellow. It's like within hours it gets all the way totally yellow. This plant was fine yesterday when lights were on.. I go in this morning at lights off and this plant was dead.. that fast it happens.. I have no pests. No RAs no mites no nothing in this room. My first time ever in all my years of growing this has happened. But this is the first time I've ever had temps this hot too.



This is the left side. Mountain Apple OG. You can see the yellowing on the hot spots.



Right side is pineapple chunk. With hardly any yellowing. Last run was all pineapple and where I had 4 plants within a week just die literally overnight.

[Andyo]

I dont see any fans for circulation of air.
The amount of air movement up through the plants from ground level is important.
It will even out the hot spots, enabling the plants to breath better an cool themselves.A

[issack]

It's a wind tunnel in there. I have 2 860cfm blower fans over the canopys and it moves a lot of air. And 2 oscillating fans on hi at each end. The plant that just died is in a spot where it's not in a hot spot at all and it's under the A/C where it's the coolest. I thought of that but couldn't see where a dead spot was with air anywhere. It kinda perplexes me now because this plant isn't in a heat area where some are close and yellowed. I vegged a week too long on this run.

[Andyo]

Ok understood ,i guess your observation will have to work it out.
process of elimination of possible causes. space taken up by over veg made it worse than the time before?
Fact the problems in a group of plants .
And again i say getting air up through the plants is still advantageous more than over the canopy
Even if lack of is not the cause.
Maybe your blowing a gale made the effected plants over transpire.?

What are you growing in , coco drip feed or ebb/flow hydroton ?

[issack]

You're right. Just going to have to sort it out with all possible causes. All my plants are swaying in there from the air that the two oscillating fans pump out. Maybe I might need to get some more fans like floor fans to push up or something.. Or maybe it's not heat issues. Maybe it's slime build-up. But I clean my rez well and it's chilled at 64 and I use biowar in my feeds with sm90. My roots looked white and nice on the dead plant. This is coco drain to waste.. I hate troubleshooting this crap. Lol

[microbe]

bonjour. fusarium ou pythium ....si la plante meurt rapidement . vous pouvez essayer eau de javel pour sauver ce qui reste a sauver.

[issack]

Originally Posted by microbe

bonjour. fusarium ou pythium ....si la plante meurt rapidement . vous pouvez essayer eau de javel pour sauver ce qui reste a sauver.

Sorry bro but I can't translate that. Might be the answer and I can't understand . Haha

[A.C.A.B]

Hi !

He said something like "it could come from a fungal infection such as fusarium or pytium, you could try to treat it with some bleach (sodium hypochlorite)."

I agree with him, this kind of fungi could very well kill the plant all of a sudden without previous signs. It develops inside the stem and once it disrupted the sap vessels the plants dies very fast.

Good luck !

[issack]

Seems as though that might be it. I've ruled out heat. My res water is at 64 i clean it once s week. Could be build up in my pvc lines like bacteria. I use mills nutrients and also sm90 in my feed as well as of bio war microbe tea. I thought I was doing good from preventing bacteria slime with This regimen. This might very be a fungi.

This is coco DTW. And I feed every hour and a half with slight run off. Plants look amazing and are packing on weight by the day. Then one will just die out of no where. Must be some kind of fungus.

[HereIgrowagain]

Just wondering, have you by any chance been spraying any foliage feed?