Few Yellow Spots? Help Please!

Damon Elder

Damon Elder

Member
Hello everyone. There is probably already posts out there about my question but I have searched online about yellow spots but they all say nitrogen deficiency or spider mites. I have 2 Jack Herer plants and they just turned 3 weeks old today and I have done 13/11 light cycle from day 1 of seed due to my limited grow space. Back to the question though, there are not very many spots just one or two on a few leaves on each plant and I don't see any sighn of spider mites or nitrogen deficiency so if anyone knows what it is or if it is even light stress please let me know. I'm a beginner and it's my first grow. I'm running a 400w hps with a reflective hood inside a 3x3x5 grow tent. I will post pictures around 1am tonight when I get off work. Any answers will be appreciated. Also my low temp is 75 and the high is 86 at all times and I do not have any ducting just 4 fans but like I said I will post pics. Smoke on:weed:
 
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potsmoke831

Member
plants probably arent digging 86 degree weather
also 13/11 isnt light schedule for veg
as for the spots idk..
nitrogen/mytes/bugs in general? but i had some plants under a hot light and they go ravaged and turned yellow.. couldnt tell u for certain but if ur plants are 3 weeks old give them more light
 
ODBUD

ODBUD

Well-Known Member
He is doing 13/11 from jump street due to the limited space, it's only a 5ft tall grow tent, with the reflector he only has about 3 ft of grow space.

Spots on the leaves can be fungus if it is raised here is a good resource for identifying deficiencies. It can also be a potassium deficiency. I would also suggest getting an exhaust fan to pull stale air out of the room and replace it with fresh air, just recirculating the air in a small tent can cause excessive moisture and high humidity potentially leading to fungus or mold. Place the exhaust fan in one of the roof ducting holes to pull off heat and moisture. This will create negative pressure in your tent and pull clean air in from the bottom. Additionally, your temp is going to get higher than 90 without exhaust once the plants grow taller to the light. How old are the plants, if you don't have a dimmable ballast it could be too much light depending on the age of the plants.

Post pics soon for more details.

https://www.icmag.com/ic/showthread.php?t=231387

def chart.jpg
 
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potsmoke831

Member
ODBUD said:
He is doing 13/11 from jump street due to the limited space, it's only a 5ft tall grow tent, with the reflector he only has about 3 ft of grow space.

Spots on the leaves can be fungus if it is raised here is a good resource for identifying deficiencies. It can also be a potassium deficiency. I would also suggest getting an exhaust fan to pull stale air out of the room and replace it with fresh air, just recirculating the air in a small tent can cause excessive moisture and high humidity potentially leading to fungus or mold. Place the exhaust fan in one of the roof ducting holes to pull off heat and moisture. This will create negative pressure in your tent and pull clean air in from the bottom. Additionally, your temp is going to get higher than 90 without exhaust once the plants grow taller to the light. How old are the plants, if you don't have a dimmable ballast it could be too much light depending on the age of the plants.

Post pics soon for more details.

https://www.icmag.com/ic/showthread.php?t=231387

View attachment 3510857
Click to expand...
whats a jump street?
 
Damon Elder

Damon Elder

Member
ODBUD said:
He is doing 13/11 from jump street due to the limited space, it's only a 5ft tall grow tent, with the reflector he only has about 3 ft of grow space.

Spots on the leaves can be fungus if it is raised here is a good resource for identifying deficiencies. It can also be a potassium deficiency. I would also suggest getting an exhaust fan to pull stale air out of the room and replace it with fresh air, just recirculating the air in a small tent can cause excessive moisture and high humidity potentially leading to fungus or mold. Place the exhaust fan in one of the roof ducting holes to pull off heat and moisture. This will create negative pressure in your tent and pull clean air in from the bottom. Additionally, your temp is going to get higher than 90 without exhaust once the plants grow taller to the light. How old are the plants, if you don't have a dimmable ballast it could be too much light depending on the age of the plants.

Post pics soon for more details.

https://www.icmag.com/ic/showthread.php?t=231387

View attachment 3510857
Click to expand...
I do have 2 fans blowing in cool air into the bottom of the tent, 1 is blowing directly at the light and one is blowing cool air directly into the fan that is blowing on the light. I can only feel heat about 4in from the light and my light is 2ft from my plants. The other 2 fans are blowing out of the top for exhaust. I also keep my tent doors open quit a bit at the top to help with fresh air, I'm not stealth growing so light showing doesn't matter to me. My humidity is always under 40% and like I said they are 3 weeks in veg but I'm using 13/11 light schedule to basically autoflower do to my limited grow space with a sativa dominant strain. I know you're supposed to use 12/12 but I figured an extra hour of light wouldnt hurt until they start flowering of course. I will post pictures later tonight when I get home from work. I also don't think it is fungus due to very few spots but then again I am new to growing and it could just be the start. I do use a spray nutrient solution as well. Hope this helps clarify things alittle and I know pictures help a ton, thanks and Stay Frosty:mrgreen:
 
green217

green217

Well-Known Member
I get spots they start yellow will develop to a red and the brown(dead tissue). I used a calmg supplement cleared up my problem. Is it just on the older/larger fan leaves?
Some strains seem to want more than others, I have an OG Kush that is a CalMg whore. Also gotta have your PH right to allow it to get to plant.
Potassium like some else mentioned is definitely possible too.
good luck
 
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Damon Elder

Damon Elder

Member
green217 said:
I get spots they start yellow will develop to a red and the brown(dead tissue). I used a calmg supplement cleared up my problem. Is it just on the older/larger fan leaves?
Some strains seem to want more than others, I have an OG Kush that is a CalMg whore. Also gotta have your PH right to allow it to get to plant.
Potassium like some else mentioned is possible too.
good luck
Click to expand...
There is one to two yellow spots on like 6 to 7 leaves total out of both plants and yes it is on the bigger leaves. My tap water comes out at 7.0 ph so I usually leave it alone but I could ph it down to 6.5 if that would be better and it only started a week ago and it hasn't gotten worse nor have the spots that are there disappeard yet. I did transplant them a week ago as well and haven't feed them nuts due to there are plenty of nuts in the roots organic to last at least a few months I figured and didn't want to burn them
 
green217

green217

Well-Known Member
Damon Elder said:
There is one to two yellow spots on like 6 to 7 leaves total out of both plants and yes it is on the bigger leaves. My tap water comes out at 7.0 ph so I usually leave it alone but I could ph it down to 6.5 if that would be better and it only started a week ago and it hasn't gotten worse nor have the spots that are there disappeard yet. I did transplant them a week ago as well and haven't feed them nuts due to there are plenty of nuts in the roots organic to last at least a few months I figured and didn't want to burn them
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My tap is close to the same, my nutes adjust themselves at 6.5. I think that CalMg likes it around 6.5, not to sure though check some nutrient uptake charts and see for yourself. U may be ok at 7. CalMg is IMO the most essential supplement, at least in my grow experience.
Try and fade off on using it around midflower though, from what I understand to much can cause buds to become more "airy".
 
Damon Elder

Damon Elder

Member
green217 said:
My tap is close to the same, my nutes adjust themselves at 6.5. I think that CalMg likes it around 6.5, not to sure though check some nutrient uptake charts and see for yourself. U may be ok at 7. CalMg is IMO the most essential supplement, at least in my grow experience.
Try and fade off on using it around midflower though, from what I understand to much can cause buds to become more "airy".
Click to expand...
Thanks! I will definitely look into calmg then
 
Damon Elder

Damon Elder

Member
This is my tent set up and it stays like this 24/7 as well as temps and humidity. I don't think it's a bug problem because I don't see any sighn of any bug in my tent but I could be wrong that's why I'm asking for help though. Hope these pics help out but if you need more just ask I'll do my best
 

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