Yellow Spotting and Necrotic Spots on Leaves

Since about three weeks ago, my plant has started to show round spots and mottled areas on the leaves. The spots start out light-green and progress to yellow as time passes, whereas the pale green mottled bits necrotize with age:



What STRAIN are you growing?
DNA Genetics OG Skunk

What was the establishing technique? (Were the seed or clone?)
Seed

What is the age of your plants?
Just shy of four weeks into veg

What Technique are you using?
LST

What substrate/medium are you using?(Hydroton, RockWool etc.)
Coco Coir

What Nutrient's are you using?
GHE FloraDuo, half-strength

What is the pH of the "Tank"?
pH of the water going in is around 6.5

Is your water HARD or SOFT?
Very hard

Has plant been recently pruned, cloned off of or pinched
Recently removed a few leaves for space reasons, and some more because of mites.

Have any pest chemicals been used? If so, What and When?
Neem oil and Bronner's Peppermint Soap, about once a week since two weeks ago.

Are plant's infected with pest's
Yes, there is a light spider mite infestation, but the sprayings and humidity seem to be keeping them in check.

What's going on here? Something serious? Or just hungry? Any input is appreciated!

the spider mites are destroying your leaves which is making it hard for the plant to make food and transpire. kill the mites and your problems will go away. i don't have any organic solutions that actually kill mites. but a hot shot pest strip in your cab for 3-4 days should kill everything.

What you describe sounds like a bastardized version of Septoria (aka black spot disease). The totally random pattern looks as though you splattered paint on them, which again makes me think "disease". If the progression includes yellowing and defoliation, then I would begin to treat it like Septoria. This is a fungal disease and I found results using Kop-R-Safe at the highest dosing rate.

Also, be sure to clean up ALL dropped leaves and don't splash water when you feed and/or water, as this is the vector for the spores to spread to other plants.

Good Neem is said to be effective for treating spider mites. If you're not using your treatments every three days then you're letting new mites hatch and fighting a losing battle. You can also use isopropyl alcohol, usually mixed at a 50-50 ratio with clean water, applied thoroughly to the leaves EVERY THREE DAYS.

Azamax or Azatrol will completely eliminate the mites.... when used properly and all surrounding areas are cleaned up accordingly.

It's also safe to use in a grow room/cab/closet without worries of it leaching into your living areas.

5ml Azamax or Azatrol per gallon of clean water.
Add one capful (10-15ml) 91% isopropyl alcohol
Add 2-5 drops of a detergent only dish soap... just enough drops until a water drop spreads on the leaf instead of beading up and rolling off.

Get a small sprayer (you only have a few plants), put on some gloves and a bandanna/dust-mask and spray your plants completely... cover all surfaces but do not get any of the solution in your medium or res.


For the soil you'll want to add 1ml Azatrol or Azamax to a gallon of good water, pH it to 6.0 for hydro and 7.6 for soil and water it in well on your next watering. Do this again in a week.

Your grow area needs to be clean with smooth surfaces. Mites don't like smooth and smooth is super easy to clean. Smooth, clean and white.
Wipe all those surfaces down with a 10% bleach solution while your plants are drying out from their spray-down in the bathroom tub.


From now on....

- No clones from outside sources unless you have a quarantine area they can stay in for a month and you're ready to treat them for mites, aphids, PM and all the other nasties out there. Easier to just say no.

- No plants from the outside can come into the house. You want houseplants, I highly recommend you start from seed and use pasteurised soil to prevent bug infestations.

- Check all the outside plants around your living area and surrounding areas if you can. Identify any mite infestations, gardens and flower growers can be a big source. Avoid those areas and try to keep those people out of your house.

- Don't go in other gardens until you fully understand how mites and other problems work and are cured, prevented.



Make sure you soil drench your gals with the 1ml/gallon on the first day of flower. Gives you 30 days of protection and my super sensitivity hasn't been able to detect it in the end meds.

Hoping you don't also have Sptoria... kinda looks like you spilled stuff on the leaves in the light but it isn't. Hmmmm

Stay Safe!

I did a google image search on Septoria and couldn't find anything that quite resembled what I'm seeing. Here's a better picture of the full plant that I took before spraying today:



Don't know what it is, but darn it's pretty!

The mites probably came from a couple of banana plants I bought from Ikea about a year back. Apparently spider mites looooove banana plants.
I have seen the weird mottled leaves in a few of my past plants as well to a lesser extent, and the weird thing is all the affected plants were DNA Genetics freebies (but not all the freebies were affected)... Just gave it another spraying, lowered the pH to about just below 6.0 (needed a shitload of pH down, about 3x what I normally use), upped the nutrients, and flipped to 12/12. We'll see how well that goes soon I hope.

Yeah, see, that's what made my Dx so difficult in the beginning. I need to see if I still have pix of the beginning of the infection, it didn't look like ANYTHING anyone had ever seen. Interestingly enough, the leaves I'll depict here were a negative of yours. It's been a few years since I've looked at these, so right now I'm taking back my first guess of Septoria, especially since you don't mention the plant defoliating and that's one of the indicators of an infection.

So, if the plant's growing well, maybe this is just an odd expression of variegation. I've truly never seen anything quite like it, except maybe some pothos.

Yeah growth seems to be doing great, but the lack of chlorophyll kind of bothers me. Oh well, I'll see how this goes and hopefully I'll get some good bud out of it. So far all seeds from this batch have been male. Here's hoping otherwise

Ever figure out what was the cause? I'm having a similar problem, which looks to be the same as yours and can't quite find the cause. Thanks!

I'm feeling the necromancy here too...I'm facing a similar problem.

magicbean said:

Since about three weeks ago, my plant has started to show round spots and mottled areas on the leaves. The spots start out light-green and progress to yellow as time passes, whereas the pale green mottled bits necrotize with age:

[URL=https://www.icmag.com/ic/picture.php?albumid=19245&pictureid=819191&thumb=1]View Image[/url] [URL=https://www.icmag.com/ic/picture.php?albumid=19245&pictureid=819192&thumb=1]View Image[/url]


What substrate/medium are you using?(Hydroton, RockWool etc.)
Coco Coir

What Nutrient's are you using?
GHE FloraDuo, half-strength

What is the pH of the "Tank"?
pH of the water going in is around 6.5


What's going on here? Something serious? Or just hungry? Any input is appreciated!

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You will get plenty of advice on the spider mite. Mine, for what it's worth, is to kill the grow and cremate it, fumigate and start again from seed, or using clones from a friend that are guaranteed mite free.

For your next grow, you will need to get a couple of things right. Those spots, for instance, look like a deficiency and it is probably one or both of calcium/magnesium.

This cal/mag deficiency is endemic to growing in coco coir and is easily overcome with a supplement readily available in a store near you (I've been reading up on it, looking to make the switch from clay).

Your PH at 6.5 seems high. I don't grow in coco coir yet but you really must check that this figure is correct. If too high it will lead to nute lockout of more than just the essential cal/mag that they appear to be missing. Be careful not to go too low with PH either, I am recovering from that mistake right now.

If you are reusing nutrient solution, the PH will always change after each run. I wait a few hours after a watering event, adjust the PH and check again just before the next watering.

Peace

I have only had mites a few times and kicked their ass each time....yeehaw...give up is not an option to me...die you little bastards die..mites suck

help us pleeeez

help us pleeeez

stoned-trout said:

I have only had mites a few times and kicked their ass each time....yeehaw...give up is not an option to me...die you little bastards die..mites suck

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What did you do? I have 3 beatiful plants in flower that i finally realized have mites, i just got a veg tent set and nursing some clones and mothers. I think I have a legit GSC clone... Etc. I gotta kill these fucks. We all got to. I will never trade clones again.