DenseBud's 400-watt HGS Avalanche w/ FoxFarm Nutes & Soil Grow

Ya, they're exploding right now! I saw some brown spots on the leaves of one plant the other day. I tore off those 2 leaves. Today, there are a few more spots on other leaves of the same plant. It's hard to see looking down on the leaf, but if you look up from underneath with backlight, they stand out. It's only on the bigger fan leaves.

I will pull another leaf off and try to take a picture.

Nice Pics! Those brown spots might be an MG deficiency?

crackbaby said:

Nice Pics! Those brown spots might be an MG deficiency?

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Thanks. I guess it could be a MG problem. Though, I am using CalMagPlus with every feeding. Will take some pics when the lights come on tonight that will hopefully show what I'm seeing.

During my feeding tonight, I noticed more brown spots and took a bunch of pictures. I've posted details below and would appreciate any help.


Some information that might help determine what the issue is: I'm watering about twice a week when it feels dry/light. Every other watering, I mix in my nutes according to the FoxFarm schedule. So, since I'm in week 4 of flowering (or week 8 altogether), I added the following to 4 gallons of ph 6.5 water:

8 tsp Grow Big
8 tsp Tiger Bloom
4 Tbl Big Bloom
2 tsp Beastie Bloomz
8 tsp CalMag Plus (note - prior to this feeding, I had only been doing 1 tsp/gal but since some folks think it might be a MG deficiency, I stepped up to the accelerated dosage this time).

This is what it looks like looking at the top of a leaf. It's impacting one plant more than the others and seems to be concentrated on the upper fan leaves:


And here's some shots looking through the bottom of the leaf:







This is just a shot of one of the main colas... overall, things still look pretty good.

dont think the nutrients are the problem.

I can't say for sure, but just a thought - seems the spotting is kind of following the veining in the leaves, just as a mag. deficiency yellows the veins - too much magnesium maybe?

I take that back - this drawing looks just like your problem, that would mean you're still magnesium deficient. Too much calcium locking it out then?

Had to try the link, I can't seem to upload a pic right this second.

http://www.gardenscure.com/420/attachments/plant-nursery/161835d1140371422-nutrient-deficiency-toxicity-salt-buildup-hormone-magnesium.jpg

Thanks. I am hoping it's a mag issue and the extra Cal Mag Plus will fix it. I guess we'll see!

I'm sure you know already, remember - damage done from pretty much anything, doesn't go away. About all you can do is make an educated guess and wait it out, see if further damage occurs.

DoeEyed said:

I'm sure you know already, remember - damage done from pretty much anything, doesn't go away. About all you can do is make an educated guess and wait it out, see if further damage occurs.

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Ya, thx. I pulled off a couple of the worst leaves and took a mental picture of the remaining. Will give it a couple days and see what happens.

So after looking around a few places, I'm leaning more towards it being a fungus. My nutrient regimen is pretty solid (every other watering), I use CalMagPlus, the water/mixture is always the proper ph... and pictures of what other people say is rust fungus looks just like what I have. I checked it again tonight and had to pull off more leaves. The buds seem to be doing alright at least. I imagine it's only a matter of time before it moves to the other plants. Need to see what I can use at this stage of flowering.

Rust fungus, eh? Haven't seen that before, now you've got me on a google mission! Sounds nasty though.

DoeEyed said:

Rust fungus, eh? Haven't seen that before, now you've got me on a google mission! Sounds nasty though.

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People say neem oil kills it. I just don't know if I can apply neem oil this far into flowering.

Whatever is affecting the leaves on Plant 1 is continuing to eat away. I had pulled most of the dead leaves off yesterday and today there were several more. It's to a point now where I have basically no fan leaves left on the main cola of Plant #1.

I went out and picked up some Green Light Neem Concentrate tonight @ Lowes. My plan is to spray plant 1 tomorrow before lights-out and if no harm comes to the plant, I'll spray the other two for good measure in the following days. Really hope this does the trick.


Plant 1 - Dying Leaves Still Attached:


Close-up of dying fan leaf on Plant 1:



Plant 1's Main Cola w/ Dying Leaves Removed:


Group Shot:

Well, other than those dead leaves, they're looking good!

Thanks DE! They're getting mighty frosty. Smell great too. Good thing I have another group vegging that should be ready to flower in a week or two. I don't think I could leave these alone till harvest time otherwise.

lol...I hear ya, being patient is hard as hell sometimes - especially once they start glistening at you.

Getting a handle on that fungus?

crackbaby said:

Getting a handle on that fungus?

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I hope to soon. For various reasons, it's been difficult to find the right time to spray over the last couple days. Currently it looks like I'm going to spray early Monday AM. Hasn't spread to other plants yet.