Lime green leaf chlorosis, possibley hemp streak virus?? Diagnoses appreciated

[magnum gom]

600 w MH with cooled reflector hood
Light cycle 20/4
Light distance 70 cm from tops
Temp highs of 30, Lows 25 (too high I guess)
RH 40 - 55
Gold Label special light mix soil
Bio Bizz nutes - grow, bio heaven, root juice
Plants are two weeks old
Strain Magnum Gom auto from Zoes Seeds
Ph between 5.9 and 6.8

Very strange pale green discoloring on the leaves.
The only thing I can find similar online in tobacco mosaic virus or hemp streak virus.
Its only affecting two plants the rest are fine..
Very mixed opinions out there as to whether tobacco mosaic virus can even affect this type of plant..

Any one have some solid idea as too what were looking at?

 

[Waira]

MG- We see this color break fairly often here, and to date, I have no solid explanation for it; usually it stops after a while, but not always, and the plants seem to do fine otherwise,...but indeed, this color break is a common symptom with viral infections, but it's not diagnostic by itself, other co-symptoms should be present before real suspicion should start,... As for trans-species viral infections, it's real, make no mistake! It's a common occurrence in the botanical world,...
I see some leaf curling, and new growth distortion,.. is the RH% low in there, and how far away are the lights? Ambient T is one thing, but proximity heat/intensity is another, and these symptoms look like heat stress, mostly,.. But leaf distortion is also a symptom of viral infection as well, but more common is lateral curving, uneven growth on either side of the mid-rib,... It's on more than one plant, from the same breeder? I don't like the odds on that,... Is Zoes Seeds a bank, or breeder? There are so many hack-shite breeders these days trying to get in on the auto scene, many are pumping out crap genetics,... Now, the problem is, there's no way to confirm viral infections by just looking at symptoms,... it has to be tested by a lab, or those Agfia test kits, and those are all type specific, meaning it tests for only one kind of virus,.. a negative result only confirms for that specific virus, another type may/will not test positive,... It's economically harsh too, BTW,...
So, lets see about your environmental info, RH% and light distance first,... if these are OK, then I'd have serious concerns about potential viral infection,.. it's very very rare, just so you know, I don't want to alarm you overly much, but better safe than sorry! Viral infections are the worst, you have to basically "burn everything to the ground" that has had contact with those plants-- tools, pots, equipment, soil, etc.... and a sterilization process with Physan-20 or something like that,... I'd be tempted to to notify the breeder as well, with pics, depending on your security and all that,...

 

[magnum gom]

Hey Waira,
Thanks for the thorough reply and taking such interest in my post!
MG??
RH has been fairly low MAX/MIN of 40 and 65 but for the most part (when the lights on 20/4) Between 40 and 50.
Light distance is at 70 cm from the tops of the plants.
Temps are at 30 degrees for pretty much the full 20 hours of lights on, summer here.
On the website this breeder states that this strain prefers a temperate climate.
So I think the Temp is definatley an issue, that's why I bought the cooling hood as Temps were going up to a max of 34 a week ago!!
The hood has brought it down a few degrees but its probably not enough. I've been hesitant to buy a air conditioner but perhaps its necessary.
I've just ordered some Ortho Silicium (OSA) which came highly recommended from a friend for many reasons but specifically for its ability to help the plant deal with heat.
The other plants are showing a very minimal amount of heat stress in comparison to the two discolored ones.
Zoes seeds is a seed bank, and yeah good idea I'll contact them.

 

[Two_Green_Thumbs]

I've got a 29 day old Northern Lights auto that looks the same. It's running alongside 5 others that look pristine other than borderline N toxicity from hot soil I was too lazy to thin out or amend (ocean forest).

I've had some experience with confirmed plant virus infections (not cannabis) that can look vaguely similar, and seen quite a few variegated plants due to random genetic mutation. My gut says probably a random freak thing, but I'm curious enough to do some more testing.

If it can be shown that it will move from one cannabis plant to another, or even better to a more common species that can be sent to Agdia for a broad panel of tests, even better. Plant virus testing is tricky though, and I wouldn't believe it until I saw a clear PCR test result on two infected plants.

In my case the plant is pretty strong so I'm not going to sweat it until I need to. It is growing out of it for the most part, with the appearance changing slightly in the newer fan leaves. I wouldn't worry unless other more serious symptoms develop.



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[magnum gom]

Hey two green thumbs,
I also have a slight N problem as I gave them a little too much grow fert, leaves are very green and showing a wee bit of nute burn.
It crossed my mind that perhaps its a nutrient lock out due to too much N, but the plants have had this strange discoloration before they were even fertilized so I rule that out.
The strange thing is, although my temps are high (around 30) only the two plants with the discoloration are showing such strong signs of heat stress.
The others are more or less showing no sign of heat stress while these two definatley are.
Weak amune system related to the discoloration?
So hard to tell what it means though.
@Waira what are your thought in general of my temps and humidity?

 

[Two_Green_Thumbs]

Plants are weird, and their immune responses are all wrapped up together. It seems pretty plausible to me that you hit the nail on the head. Could be that an infection has made them more susceptible to heat stress.

I may have spoken too soon on my own plants. I'm seeing some pretty rapid deterioration on the suspect plant only. I'm well aware that I have some Ca lockout due to soil pH issues (that can be dealt with easily enough), but that particular plant has something going on that I do not like the look of. Could be that the low soil pH is adding more stress than the plant can handle, and the infection is getting a leg up now that the plant slowed down a bit. Mayhaps a random mutation that manifests as mottling, but the rapid symptom progression is pretty suspect...

I don't think I'll keep any other seedlings with that look if I have a choice.

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[CTb1]

View attachment 756140 View attachment 756141 View attachment 756142 View attachment 756143 View attachment 756144 View attachment 756145
600 w MH with cooled reflector hood
Light cycle 20/4
Light distance 70 cm from tops
Temp highs of 30, Lows 25 (too high I guess)
RH 40 - 55
Gold Label special light mix soil
Bio Bizz nutes - grow, bio heaven, root juice
Plants are two weeks old
Strain Magnum Gom auto from Zoes Seeds
Ph between 5.9 and 6.8

Very strange pale green discoloring on the leaves.
The only thing I can find similar online in tobacco mosaic virus or hemp streak virus.
Its only affecting two plants the rest are fine..
Very mixed opinions out there as to whether tobacco mosaic virus can even affect this type of plant..

Any one have some solid idea as too what were looking at?

I have the exact same thing going on on an auto mazar from Dutch passion.
https://www.autoflower.org/threads/...leaching-pattern-not-environment-nutes.59809/

It may be unstable genetics causing a strange genetic variation or it may be a virus. Either way I got rid of it.

Did you notice it on the first set of true leaves?

 

[Journey Man]

Hey. I wouldn't worry. This happens time to time... some strains more then others....
I agree, they are more sensitive for heat and a low RH%.. I can't say way but, from what I have seen they normally start to grow fresh, normal green leafs around day 20.
Thats my experience anyway.
I have 2 girls having this right now... day 13 and 15, autowhitewidows. I know they will sort it out in a week or so.
Will check in and so how it goes for u after some days.

 

[Waira]

My bad, i overlooked the ealrier T/RH/height info!.....RH% range is fine, T is on the high side,... cool ducted light at 70cm is fine,...how's the air movement, not direct and fairly strong? Any combo of low RH, high T, strong air movement, and light proximity intensity can start causing that leaf rolling, a classic heat stress symptoms,...
wait, what? now you tell me! the slight overfert'ing, that can account for the newest growth leaf distortions, coupled with the borderline environmental conditions,... makes better sense now!
Good, on the Si supplement, lots of other benefits with it as well,...
...so, it also follows that the color break plants are not as tolerant with nutes and heat as their normal sisters,... again, a viral infection is very unlikely, and now that the other symptoms can be better accounted for, I'm leaning toward this being just that unexplained color breaking mentioned before,... let them be and see for now....

 

[CTb1]

My bad, i overlooked the ealrier T/RH/height info!.....RH% range is fine, T is on the high side,... cool ducted light at 70cm is fine,...how's the air movement, not direct and fairly strong? Any combo of low RH, high T, strong air movement, and light proximity intensity can start causing that leaf rolling, a classic heat stress symptoms,...
wait, what? now you tell me! the slight overfert'ing, that can account for the newest growth leaf distortions, coupled with the borderline environmental conditions,... makes better sense now!
Good, on the Si supplement, lots of other benefits with it as well,...
...so, it also follows that the color break plants are not as tolerant with nutes and heat as their normal sisters,... again, a viral infection is very unlikely, and now that the other symptoms can be better accounted for, I'm leaning toward this being just that unexplained color breaking mentioned before,... let them be and see for now....

This is why I'm asking if it was from the first set of true leaves @Waira knows what he's talking about. If it has occurred from the first set of leaves I'd say genetics. If not it very well could be environmental factors.
I have the exact same look on one of my plants and I know it's not the environment or nutrients .. probably genetic instability causing variegation, this can be caused through genetics or a random occurrence
which is called chimeric. It is manifested when some of the plant cells are not able to produce sufficient amounts of chlorophyll resulting in distortion of leaf pigments.