Rust spots on leaves

JadedMarxist · Apr 11, 2020

Good day folks.

Some story. I'm at around 32days in to full on flowering.

I noticed a white fluffy spot on a leaf about 5 days ago. Some one told me to spray h2o2 and I did sprayed both my plants down with drugstore 3% mix.

That was 5 days ago only 1 plant had the white pm. My other plant did not have any also my tomatoes plant did not have any pm either. And these plants get moved oftin when I working in there and oftin touch each other.

So after I sprayed the plants down with just 3%h202 and water, I have yet to see and pm (good right).

But the day after I sprayed I noticed a bunch of little yellow dots and 1 leaf of the plant that showed the pm. Like 8littke yellow dots.

Day 3 after spray i noticed that a couple more leafs had spots on that plant and now my tomatoes plant has it all over also

Day 4 after spray I'm noticing the spots have turned to larger and I can't wipe it off its like a rust has grown on my plants and now it's all over the original pla t and tomatoes and is now starting in to my 2nd plant. I'm about to ho run my dwc numbers check ph and temps and will report back Ina few with pics. I'd hate to lose these now after everything 4 weeks away from finishing.

Be back with pics Ina few

JadedMarxist · Apr 11, 2020

Here is a shot from yesterday thru my microscope

JadedMarxist · Apr 11, 2020

Here some pics had a visitor so had to wait a but before I could get pic hopefully you can see the spots on these shit pics %

Jimster · Apr 11, 2020

It looks almost like insect damage like a spider mite or similar critter would leave. It could be a coincidence or the insects might have provided a gateway for PM to get on your plants, if that is what the problem was. Spider mite damage often starts with yellowish or reddish spots, then they turn brownish as they scar over. They hang out under the leaves and are often so small that they can't be seen without magnification of some kind. Spider mites also produce webs that might be mistaken for PM.
Mites are a bitch as they often go undetected until the damage is obvious. A "slightly off" plant is often the victim, and some plants will be full of them while the one next to it is untouched. Difference in taste, I guess!
I don't think that 3% H2O2 would cause spotting like that. I've never used it but it is generally pretty safe.

JadedMarxist · Apr 11, 2020

Ive just recently got a USB microscope so I've been experimenting with it alot taking pics of the plants.

I've never seen any bugs not that I've been specifically looking either. Mind you. Also I installed a 1000w hps for the last couple days and the light didn't seem to close or does it look like light damage, but I slept in one morning and the 1000whps came on in the closed up tent for 2 hours and my temps were above 50C but I'd expect the damage to look different from heat stress.

I will defenatly be looking for mites now. The pm or what I thought was pm at least look like a drop of nute solution dried up on the leaf not like spider mite webbing.

Ill look more closely with the microscope and see how it goes for the next 2 days I mean if I Wasent looking closely enough I might not even have noticed the spot asthere so small.

Thanks for the suggestion appreciate it.

I was worried the tomatoe plant may have given some disease to the mj

JadedMarxist · Apr 12, 2020

I been looking at these plants for hours now and I can not find any bugs!

But I have another clue maybe a leaf I found today has very distinctive look to it.

A thought these spots look very different then the little yellow spots.

See what you guys think!

JadedMarxist · Apr 12, 2020

I should clarify but those spots are not bugs but white like I can shine a light from the back of leaf and you can see the difference. It's not something that's been dropped on the leaf more like its a round spot Devoid of chlorophyll.

Jimster · Apr 12, 2020

JadedMarxist said:
Ive just recently got a USB microscope so I've been experimenting with it alot taking pics of the plants.

I've never seen any bugs not that I've been specifically looking either. Mind you. Also I installed a 1000w hps for the last couple days and the light didn't seem to close or does it look like light damage, but I slept in one morning and the 1000whps came on in the closed up tent for 2 hours and my temps were above 50C but I'd expect the damage to look different from heat stress.

I will defenatly be looking for mites now. The pm or what I thought was pm at least look like a drop of nute solution dried up on the leaf not like spider mite webbing.

Ill look more closely with the microscope and see how it goes for the next 2 days I mean if I Wasent looking closely enough I might not even have noticed the spot asthere so small.

Thanks for the suggestion appreciate it.

I was worried the tomatoe plant may have given some disease to the mj

Diseases are pretty uncommon in MJ, but bugs are notorius. After replying earlier, my younger "associate" who helps me with things told me that there is "movement" in the plants. I checked things out but didn't really see anything, but I'm getting up there in years and can't see things like I used to. Evidently a plant that was orphaned to me about two weeks ago brought a bunch of mites in with it. I normally purge anything coming in but this one showed up unexpected and was thrown in under the lights. Since they are still vegging, I'm hitting the room with a hot shot strip. It gives off toxic fumes and kills damn near anything. I wouldn't use it during flowering, but it seems ok for vegging and is still used in agriculture.
When I looked VERY closely, I could see the beginnings of the tiny dots that turn colors before finally turning brown. I was fortunate to find them so early, so it really pays to look over your plants anytime things start to look different for no real reason. Often the damage happens very slowly and goes unnoticed.

Jimster · Apr 12, 2020

JadedMarxist said:
I been looking at these plants for hours now and I can not find any bugs!

But I have another clue maybe a leaf I found today has very distinctive look to it.

A thought these spots look very different then the little yellow spots.

See what you guys think!

Those spots do NOT look like mite damage. It almost looks like something was splashed on them and not from bugs or disease, or any disease I'm familiar with. At the top of the leaf, near the stem, are a few tiny specks. This is what I was thinking was possible mite damage, but it probably isn't. That should give you anidea of how tiny the spots can be. Later, as the bugs multiply and feed more, they will begin to merge and kill of the leaf, often with webbing found.

JadedMarxist · Apr 12, 2020

This just started right after I sprayed down the plant with drugstore peroxide 3% I just assumed the other 97%was distilled water but maybe I'm wrong. Even the little yellow dots look as if they were sprayed on. Idk nothing seems suffering tho this last week they really got frosty.

Just the odd leaf weird.

On the other hand looking at my plants with the microscope to see about bugs or signs of them I discovered (Im ignorant when it comes to other plants on a microscopic lvl) but looking at my tomato plant it also has tricomes on its leaves that look identical to mj, I had no idea I honestly thought that was a mj plant thing for thc which is also exclusively cannibus. Now I wanna start looking at other plants lol

Jimster · Apr 12, 2020

Trichomes are found on a lot of plants, they are most associated with the resin balls on buds and leaves, however. FWIW, tomato trichomes aren't the same variety, so unless you have some mayonaise handy, don't try smoking them!
Ha Ha. At 60 I'm a comedian, I know! OK... I'll slink away now from where I was hiding....

JadedMarxist · Apr 12, 2020

Haha well jimster. I think your right on the money. Looking again at my plants and could not see anything then this one leaf. Never seen any movement but looks to me like some kinda egg or a buried larve but I can't make out exactly what it is. The micro pics you can see the trichs clearly. Makes me think whatever it is it's inside the leaf kinda.

What do you think? So I can determine which way to take in getting rid of this pest.

JadedMarxist · Apr 12, 2020

The rest of pics. Don't why they didn't load also the black spot you see is a piece dirt from my sloppy ass

Jimster · Apr 13, 2020

Mites usually hang out under the leaves (not on top) and lay eggs on the surface. Mites suck on the plant's juices and causes physical damage as well as using up nutrients. Those white spots or areas don't look like mites, but they could be one of several possible culprits, most of which I'm unfamiliar with.
I was hoping some of the more experienced guys have seen this before since I don't grow outdoors at al to avoid bug issues. If they are outside, they usually have bugs but they are held in check by other bugs to some degree. Inside, there are no predators and the bugs multiply unchecked.

JadedMarxist · Apr 13, 2020

They are inside but in dwc. Im thinking I can't possibably have mites. I may be wrong but average outside temps here daily high of 7-10C nightly it dipps below freezing - 1C. So I don't think I could have brought them in to my grow room.

Also I haven't been to another grow room as I only know 1 person who is actually growing and with flu I haven't been to his place or vise versa in over couple weeks now. The 2 flowering girls were clones that would be infected bad by now and the rest I've got are from seeds I planted hummm.

Looked today seems the leafs look as if no further damage yet idk. Guess I'll just watch where it progresses

higain · Jul 17, 2020

JadedMarxist said:
They are inside but in dwc. Im thinking I can't possibably have mites. I may be wrong but average outside temps here daily high of 7-10C nightly it dipps below freezing - 1C. So I don't think I could have brought them in to my grow room.

Also I haven't been to another grow room as I only know 1 person who is actually growing and with covid I haven't been to his place or vise versa in over couple weeks now. The 2 flowering girls were clones that would be infected bad by now and the rest I've got are from seeds I planted hummm.

Looked today seems the leafs look as if no further damage yet idk. Guess I'll just watch where it progresses

I have had spider mites and to me the weed leaf doesn't look like the white spots from them sucking on the leaf but the tomato dots are more similar. However the other rust/brown damage you got right after I believe was from the foliar spray. I have often sprayed with too strong neem and even nutes and get that same type thing. If so the leaf won't repair but new ones should be fine. Just keep watch on the PM and I'd recommend some neem oil (in proper dilution ;) it helps with mites, gnats and fungus.

higain · Jul 17, 2020

JadedMarxist said:
The rest of pics. Don't why they didn't load also the black spot you see is a piece dirt from my sloppy ass

You have a lot of trichomes there too - all my dealing with mites and gnats they usually stay away from trichome laden ones since its designed to catch them like fly paper. Good Luck. :)

Rust spots on leaves

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