Help Identifying Leaf Issues Mid Flower

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D_L

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I am experiencing some leaf discoloration on a few of my plants and could use some input on what the cause might be. For reference I am growing in a peat, pumice, and compost medium 33% each. I used the Build A Soil 3.0 nutrient mix when I mixed the medium. I have been feeding with Build A Bloom once a week since the beginning of flower. Also did one watering of Recharge around week 3 of flower. I use rain water with a PH of 6.5 and PPM of 34. I have been adding 25% dechlorinated tap water since the beginning of flowering also. I use quillaja 20 wetting agent every watering and freeze dried coconut water every other watering. I did a soil slurry PH reading from soil on top since I can't really get deeper in the pot, between 3 pots tested I had a range of PH 6.4-6.7. Tested water runoff at PH 6.3. I am growing auto flower strains of Twisted Gorilla and Twisted Menagerie from Twisted Trees in 3 gallon fabric pots. I am around 30 days into flower. Trying to self diagnose and one plant looks like it could be Molybdenum deficiency with what is a reddish discoloration. Just looking for some other advice or input on what excess or deficiency I might be having. Pictures attached 2 Twisted Gorilla and 1 Twisted Menagerie. Thanks for any help.


Gorilla 1
Gorilla 2
Gorilla 3
Gorilla 4
Gorilla 5
Gorilla 6
Menagerie 2
Menagerie 3
Menagerie
 
THC_AeroGrower

THC_AeroGrower

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I'd recommend watiching a video on YouTube titled "Visual Guide to Foliar Symptoms of Nutrient Deficiencies in Cannabis" by a channel called DeBacco University. He gives a great breakdown of how to identify these types of issues. It's hard to tell from pictures, but it appear to me that it's affecting the lower (older) growth more than newer growth, is that correct? I think that points to one of the immobile nutrients, but watch the video because I might be misremembering that.
 
D

D_L

19
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I'd recommend watiching a video on YouTube titled "Visual Guide to Foliar Symptoms of Nutrient Deficiencies in Cannabis" by a channel called DeBacco University. He gives a great breakdown of how to identify these types of issues. It's hard to tell from pictures, but it appear to me that it's affecting the lower (older) growth more than newer growth, is that correct? I think that points to one of the immobile nutrients, but watch the video because I might be misremembering that.
Yes it is in the lower growth. I have looked at charts and tried to identify. Posted here hoping for more insight because it seems like it could be a couple of things. My soil PH seems to be on point and my environment is pretty well controlled so my initial assessment of a Molybdenum deficiency is probably wrong since that seems related to cold temps and PH imbalance. Warmer and more humid in veg and now in the mid to low 70's with around 55-60% RH. Plants look healthy otherwise, just trying to keep them that way going into the final 4 weeks or so. I will check out that video, thanks.
 
carlosescobar

carlosescobar

155
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did the plant get near the lights, pic 4 looks to me like led burn, i had the same 2 weeks ago...if the plant gets light stress it shuts down the uptake of potassium or magnesium , i cant remember which one , like the previous post recommended de bacco is the guy to watch,
 
THC_AeroGrower

THC_AeroGrower

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I went and watched and I had it backwards, lower growth is a sign of mobile nutrient issues. just skimmed the video and I'd guess it's a Potassium issue but @carlosescobar beat me to it.
 
carlosescobar

carlosescobar

155
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I went and watched and I had it backwards, lower growth is a sign of mobile nutrient issues. just skimmed the video and I'd guess it's a Potassium issue but @carlosescobar beat me to it.
i think its potassium (which apparently only shows during bud) and its light burn or a build up of salts from too much cal mag . you learn something new everyday .lol.
 
ArtfulCodger

ArtfulCodger

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I wonder if there's a true deficiency, considering how often you're feeding. I see signs of over-feeding (burned tips), over-lighting (taco-ing and edge curl), and over-watering (leaf texture and thickness). All of which probably accelerates senescence in an auto, which is what the red blush looks like to me.
 
carlosescobar

carlosescobar

155
43
I wonder if there's a true deficiency, considering how often you're feeding. I see signs of over-feeding (burned tips), over-lighting (taco-ing and edge curl), and over-watering (leaf texture and thickness). All of which probably accelerates senescence in an auto, which is what the red blush looks like to me.
apparently according to lex cal mag has a lot of salts in it , which can build up over a grow .. i wonder if nutrients in general have salts in? i must get into the habit of flushing once or twice through a grow
 
D

D_L

19
3
did the plant get near the lights, pic 4 looks to me like led burn, i had the same 2 weeks ago...if the plant gets light stress it shuts down the uptake of potassium or magnesium , i cant remember which one , like the previous post recommended de bacco is the guy to watch,
Yes i did have some light burn/stress (top leaf tips yellowing and leaves drooping 3 hours before lights out). I'm using new lights Viparspectra XS2500 pro 2 250 watts x 2 in a 4x4. It took some getting use to compared to the cheap under $100 lights I was using before. Using the PPFD Meter app (great tool by the way) I was able to measure DLI and light spread. It helped a ton in dialing in the lights to a desirable level. I was using too much light, thinking new lights I'm going to take advantage. I took too much LOL. It's been about 2 weeks since I corrected the issue which showed up first after I turned up the intensity for flower. Thanks for chiming in, I'll look into light stress and potassium or magnesium uptake.
 
ArtfulCodger

ArtfulCodger

1,495
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apparently according to lex cal mag has a lot of salts in it , which can build up over a grow .. i wonder if nutrients in general have salts in? i must get into the habit of flushing once or twice through a grow
Synthetic nutrients are metallic salts. If you don't overfeed, you don't need to flush.
 
D

D_L

19
3
I wonder if there's a true deficiency, considering how often you're feeding. I see signs of over-feeding (burned tips), over-lighting (taco-ing and edge curl), and over-watering (leaf texture and thickness). All of which probably accelerates senescence in an auto, which is what the red blush looks like to me.
I wonder if there's a true deficiency, considering how often you're feeding. I see signs of over-feeding (burned tips), over-lighting (taco-ing and edge curl), and over-watering (leaf texture and thickness). All of which probably accelerates senescence in an auto, which is what the red blush looks like to me.
Thanks for the response. I did mention a possible molybdenum deficiency because of the red color. Upon further research it seems unlikely. Most of the fixes for that mention PH and cool temps. I cannot be certain but from a soil slurry test and my PH runoff my PH seems to be in line, as are my temps which are mid to low 70's. Also the mix I started with has lots of trace minerals including molybdenum. The burned tips and taco-ing may be from light stress/burn. I just upgraded my lights and they took a bit of getting use to. I water to dry back, usually about 36 hours when the pots feel light and the top is dry. I get a little runoff but not much. I'm thinking I need to have a bit more runoff. I water about 5% of pot size which is 20 oz. in a 3 gallon pot. Think I'm going to up that to 40 oz. It looked like senescence to me also with the red color. I have been gradually lowering temps from 82 in veg to now 73 in mid flower. I should have mentioned in my OP that about 5 days ago I added 80 PPM of potassium sulfate and cut my bloom fert from 1 tsp/gallon to 1/2 tsp/gallon. Think my initial concern was too I added too much K. I keep seeing that late flower you should up the K. I'm still learning and every possible mistake is also a chance to take in knowledge. This is my fifth grow and the best my plants have looked at this stage, think I got a bit cocky.
 
D

D_L

19
3
i think its potassium (which apparently only shows during bud) and its light burn or a build up of salts from too much cal mag . you learn something new everyday .lol.
Thanks for the video. I am not adding cal-mag. Build A Bloom is a 2-10-5 with 10% calcium and 1% magnesium which I've been adding once a week @ 1tsp a gallon. I also have Raw brand potassium sulfate which last feeding (5 days ago) I added 80 PPM and cut the bloom fert in half. I think I need to dial the nutes back a bit and have more runoff when I water. Glad you learned something too.
 
ArtfulCodger

ArtfulCodger

1,495
263
Thanks for the response. I did mention a possible molybdenum deficiency because of the red color. Upon further research it seems unlikely. Most of the fixes for that mention PH and cool temps. I cannot be certain but from a soil slurry test and my PH runoff my PH seems to be in line, as are my temps which are mid to low 70's. Also the mix I started with has lots of trace minerals including molybdenum. The burned tips and taco-ing may be from light stress/burn. I just upgraded my lights and they took a bit of getting use to. I water to dry back, usually about 36 hours when the pots feel light and the top is dry. I get a little runoff but not much. I'm thinking I need to have a bit more runoff. I water about 5% of pot size which is 20 oz. in a 3 gallon pot. Think I'm going to up that to 40 oz. It looked like senescence to me also with the red color. I have been gradually lowering temps from 82 in veg to now 73 in mid flower. I should have mentioned in my OP that about 5 days ago I added 80 PPM of potassium sulfate and cut my bloom fert from 1 tsp/gallon to 1/2 tsp/gallon. Think my initial concern was too I added too much K. I keep seeing that late flower you should up the K. I'm still learning and every possible mistake is also a chance to take in knowledge. This is my fifth grow and the best my plants have looked at this stage, think I got a bit cocky.
I don't grow autos (usually), and I don't grow organic, so I'm not much help as far as your individual inputs go. I'll just say give yourself some slack. A lot of this game is just at-bats. The more you have, the better you do.
 
D

D_L

19
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Update, the reddish leaves turned purple. Either a genetic trait or from dropping the temps during flower. Rest of that plant looks good. Did a heavier watering this morning after letting them dry back to the point of the leaves drooping. They all perked right back up. Going to experiment and give nutes to some and just water to others and see what happens.
 
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