What is going on with my cannabis leaf??

[Eledin]

I agree it looks almost fungal, either that or it some type of feces from whatever bug is around, but too me that’s looking like some sort of fungal growth maybe mixed with PM

Not sure about septoria the tiny specs broadly across the leaf looks like thrip damage, it’s a conundrum

Septoria usually has more of a yellow apprance on the leaves vs that silvery color that trips leave

Yes it looks like both insects munching and fungus growing. I know that septoria usually comes with yellow but Im throwing ideas around, Ive seen dark specs in leaf septoria but theyre also rounder and bigger. Maybe its white spider mites, can we see close ups from the back side of the affected leaves? Theyre white and very small. More than the leaves with big white spots the leaves with small white or pale yellow spots.

 

[Eledin]

You can start the treatment right away, its the same for both fungus and small insects. If it doesnt have pistils yet use potasic soap, 2ml per liter of water sprayed on the upper but way more importantly on the back side of the leaves which is where they are feasting, you see the spots on the upper side because they are munching from the bottom. Dont use neem oil, it stays for longer in the leaves and they might touch the upcoming pistils. If they already have pistils or when they show pistils, change the formula to 1:4 ratio of 3% hydrogen peroxide and water. Every 15 days until the fuckers are gone or at least to control them as much as possible. Mites can be very resillient when theyre high in numbers but maybe you can still get it in check until harvest.
If anyone has a better suggestion feel free to say it, thats just what I would do.

 

[Eledin]

Actually what I would do but I dont know if other people would is spray them like 3-4 days in a row and then go to every 15 days, or once a week if its getting worse again. I also forgot to mention, dont spray them when the sun hits the hardest or when you have the lights on, the droplets can concentrate light and cause damage to the leaves. I do it when the lights go off since Im an indoors grower or if I feel like it needs to be done right away I dimm the lights almost to the minium until theyre fairly dry with the help of the fans. Dont point the fans directly at them since you dont want them to dry too quick. Specially if youre using hydrogen peroxide, it dissapears with the water.

 

[Eledin]

Im pretty sure someone else can recommend you something stronger than potassic soap if needed to, I cant because we dont have the same pesticides here in Spain and I avoid using anything else, but sometimes you need something more agressive and it can be organic aswell. If you happen to be from Spain or the EU I can give you a few options, but again, as soon as you see pistils I would exclusively use hydrogen peroxide diluted in water, personal opinion.

 

[Sunin]

very weird. fungal, virus, critters?
it looks like her own sap that dots no? or more like faeces?
Chance for any other picture? and pic of under also in close up
I still think something is eating it

 

[Phil.D.]

Leaf septoria? @Sunin @Mikedin
Looks like some kind of fungal infection but not sure if powdery mildew or leaf septoria. My vision is not very good but that doesnt look like bugs to me. I might be wrong lets see what people has to say.
Are you meassuring your PH? The only other thing that occurs to me is a deficiency caused by nutrient a lockout but never seen it like that.

I do not believe it’s leaf septoria. I had a go with that last grow. Doesn’t look at all what I had.

 

[Eledin]

very weird. fungal, virus, critters?
it looks like her own sap that dots no? or more like faeces?
Chance for any other picture? and pic of under also in close up
I still think something is eating it

Im pretty sure that if we get a close up of the backside of the affected leaves we're gonna see mites like you initially said, the close up was from the upper side of the leave so we couldnt really see any critter. I have no doubt either that it has bite marks, what I dont know for sure is if its growing fungus aswell, which could be the case, insect pests make it more likely for the plant to catch fungus. They move shit around, they shit around, they die sticking to the leaves, they perforate the leaves, and they also weaken the inmune system of the plant.

 

[Eledin]

About the dark spots, after looking how fungus that leave dark spots look like (Im talking about sooty mould this time, not leaf septoria, never had it myself) its possible but unlikely. I think youre right @Sunin about it being sap or pooped sap from insects, aswell as with the mites. If it were thrips we would have seen them in the first picture.

 

[Beachbumm]

Just brought to flower room

You have at least one kind of bug if not more and that black stuff is either excrement &/or some kind of a fungal disease, that plants a mess friend, I wouldn't put that into my flowering room until I had it sorted out

 

[Sunin]

Im pretty sure that if we get a close up of the backside of the affected leaves we're gonna see mites like you initially said, the close up was from the upper side of the leave so we couldnt really see any critter. I have no doubt either that it has bite marks, what I dont know for sure is if its growing fungus aswell, which could be the case, insect pests make it more likely for the plant to catch fungus. They move shit around, they shit around, they die sticking to the leaves, they perforate the leaves, and they also weaken the inmune system of the plant.

yes, the little suckers hide well
and fungal on it...
and that poor plant into flower. I hope owner will sort this and that in time

 

[Fishybass]

If they were fungal bodies you should see a hyphal network of ‘fuzz’ or other spots. What is your humidity range? Are you spraying anything on the leaves? Is this generalized all over the plant or very local? I agree the damage looks like insects but you should see a raft of adult thrips or gnats flying around with that many spots or other signs for other insects like webbing and chew marks. Eggs maybe? but most common pests don’t lay black eggs. Might be worth taking a scoop of soil out and examining it under magnification for larval worms or other creepies. Maybe shake the plant and see if anything drops onto white paper.

 

[Beachbumm]

About the dark spots, after looking how fungus that leave dark spots look like (Im talking about sooty mould this time, not leaf septoria, never had it myself) its possible but unlikely. I think youre right @Sunin about it being sap or pooped sap from insects, aswell as with the mites. If it were thrips we would have seen them in the first picture.

Had to look that one up! I think there's a good chance you're right regarding sooty mold

 

[Eledin]

If they were fungal bodies you should see a hyphal network of ‘fuzz’ or other spots. What is your humidity range? I agree the damage looks like insects but you should see a raft of adult thrips flying around with that many spots or other signs for other insects like webbing. Are you spraying anything on the leaves? Is this generalized all over the plant or very local?

There's a type of white mite that dont create webs, I dont know how its called in english in spanish we call them "microacaros". I spoke about it before, the first time I had them I couldnt see anything below the leaves until I looked really close with a magnifying glass and saw the small fuckers. They also dont move for some reason, they probably stick themselves to the leaf and only change position when they run out of sap. Theyre hard to see because theyre very small and have a pale color that blends with the color of the under side of the leaves. Theyre hard to see, they dont move, they dont fly, they dont create webs, the only thing you see is the bite marks because they also dont go to the upper side of the leaves, I assume because their "teeth" are not strong enough to perforate the upper side.

 

[Eledin]

Had to look that one up! I think there's a good chance you're right regarding sooty mold

Yes it came to mind because its the one that appears when there's insect poop and/or sap but I never had it so Im not sure. Ive seen pictures and some look similar but in a more advanced stage. Well, its actually a family of fungi not just one, but they all do the same. They feed on the poops not the leaves but they cover them so they cant properly photosynthesize eventually.