Yellow leaves

I have 5 plants that have leaves turning yellow on the ends of the leaves. It started out on one plant and has quickly started on at least one branch or more on all the other plants. It started shortly after i added a 90 watt LED UFO light. plants were started on fluorescents. Not sure if that is the problem. I have sprayed them 1 time with fungicide 3. which handels fungus, mites, and insects. It has been 48 hrs since i sprayed and it is still spreading. Here is my set up.

Hydroponics/ Bubbleponics system setup in closet started 3 weeks ago from seed. closet stays open for air cirulation.
rockwool cubes in hydrotron grow rocks
1 Dual Spectrum 65 High Output Fluorescent Bulbs
1 Dual Spectrum II High Output Fluorescent Bulbs
1 90 watt UFO led lamp.
1 rotating fan
temp range 72 to 77 degrees
humidity 44% to 55%
I am using premeasured Micro and grow nutrients that came with my system from manufacture.
Thanks for any help!

Quote:

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Originally Posted by kallidah

I have 5 plants that have leaves turning yellow on the ends of the leaves. It started out on one plant and has quickly started on at least one branch or more on all the other plants. It started shortly after i added a 90 watt LED UFO light. plants were started on fluorescents. Not sure if that is the problem.

That's not the problem.

I have sprayed them 1 time with fungicide 3. which handels fungus, mites, and insects. It has been 48 hrs since i sprayed and it is still spreading. Here is my set up.

Safer's 3 in 1 had a bad batch a while back, didn't stay mixed.
If you don't shake the hell out of it before spritzing the active ingredients settle to the bottom of the container and come out way too strong for Cannabis.
Killed 3 of my friends G13s!

Hydroponics/ Bubbleponics system setup in closet started 3 weeks ago from seed. closet stays open for air cirulation.
rockwool cubes in hydrotron grow rocks
1 Dual Spectrum 65 High Output Fluorescent Bulbs
1 Dual Spectrum II High Output Fluorescent Bulbs
1 90 watt UFO led lamp.
1 rotating fan
temp range 72 to 77 degrees
humidity 44% to 55%
I am using premeasured Micro and grow nutrients that came with my system from manufacture.
Thanks for any help!

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Try spraying plain water on the leaves to wash them.

Good luck,
Weezard

The problem started before i sprayed them with fungicide. I will give them a wash though. They are all lower branch leaves if that helps. I am going to change the water and nutrients out and use a little less nutrients to see if that helps.

Quote:

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Originally Posted by kallidah

The problem started before i sprayed them with fungicide. I will give them a wash though. They are all lower branch leaves if that helps. I am going to change the water and nutrients out and use a little less nutrients to see if that helps.

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In that case the nute concentration won't matter if the PH keeps climbing.
PH extremes lock out nutes.
Hydrotron usually causes PH to rise even when properly pre-treated.
Phosphoric acid is best as a PH down.

Aloha,
Weezard

I forgot to put the pH in my first post. It was 5.8 to 6.0
After i change out the (distilled) water and nutrients i have it at 6.25 now.
pH is checked 3 times a day and has never needed adjustment.
I increased it this time with the new water so i am not so close on the low end.
I only added half the nutrients so far. I sprayed the leaves down with water to wash fungicide 3 off. I also removed the leaves and branches that were effected with sterilized scissors.
Its 6 hours later and i am starting to see brown spots on a few leaves that were not there before. :(

Quote:

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Originally Posted by kallidah

I forgot to put the pH in my first post. It was 5.8 to 6.0
After i change out the (distilled) water and nutrients i have it at 6.25 now.
pH is checked 3 times a day and has never needed adjustment.
I increased it this time with the new water so i am not so close on the low end.
I only added half the nutrients so far. I sprayed the leaves down with water to wash fungicide 3 off. I also removed the leaves and branches that were effected with sterilized scissors.
Its 6 hours later and i am starting to see brown spots on a few leaves that were not there before. :(

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I'm out of suggestions.
Looks like you need a real diagnostician here.
See if you can get Rusty Trichomes attention .

Sorry I couldn't be more help.

Weezard

Quote:

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Originally Posted by kallidah

I am using premeasured Micro and grow nutrients that came with my system from manufacture.
Thanks for any help!

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Are you using them at the same time? Knowing the brand name, dilution rates and N-P-K values might help.

I'm a soil guy, but brown spots can be from root rot, calcium defeciency, ph swings, heat and sometimes bugs.

Just brown spots...no yellowing?
What do your roots look like? (stringy and white, or brown and slimy?)
What is your bubbler schedule?
Have you ever added H2O2 (hydrogen peroxide) or any other additives to your reservoir?
What does the new growth look like? Old leaves are old news, and old necrosis (brown spots) will never 'heal'.
Is the problem spreading upwards?

If using sample packs of off-brand nutrients, I'd start looking for a replacement regimin asap, and post a couple of pictures of your ladies if possible.

Quote:

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Originally Posted by Rusty Trichome

Are you using them at the same time? yes it is what the manufacture recomended
I
Just brown spots...no yellowing? Was yellow on end of leaves of lowest branches. That has seemed to stop since i changes out the water. I have a few brown spots on a few leaves on the top now but i suspect that may have been from the fungicide 3 i used.

What do your roots look like? Roots look good. They are white and about a foot long. larger plants have long thick green roots in with the white.

What is your bubbler schedule? The bubbler runs 24/7. I was wondering if in need the water lines running since all my roots are in deep water.

Have you ever added H2O2 (hydrogen peroxide) or any other additives to your reservoir? No i have not. That is the only thing i forgot to do last night when i changed out the water.

What does the new growth look like? Old leaves are old news, and old necrosis (brown spots) will never 'heal'.
Is the problem spreading upwards? All new growth look good thus far.

If using sample packs of off-brand nutrients, I'd start looking for a replacement regimin asap, and post a couple of pictures of your ladies if possible.Will do. do you have any recomendations.

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I will add pics as soon as my camera charges.

I just took some pics and noticed the roots are turning brown. It was not that way last night.
http://i877.photobucket.com/albums/a...h/100_2241.jpg

I recommend you copy-n-paste the hydro troubleshooting form here, answer the questions, and I'm sure a hydro person should be along shortly.

But the brown slime on the roots is likely not optimal. I'd do a site search for the latest cures, and do not go overboard with corrections.