Leaves turning yellow, brown

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gnrfan316

Active Member
I got 12 plants under 3- 4ft 8 tube t5s, they're 5 weeks old and using techna flora grow, magcal and sugar daddy, stared 1/4 strength slowly worked up to 500ppm so far at 6.5 ph, the white you see is not powdery mildew it is diatomaceous earth used to kill a small infestation of fungus knats, which could ve causing my problems but i wanted to be sure. 20150821_074111.jpg 20150821_074017.jpg 20150821_074111.jpg 20150821_074017.jpg 20150821_073958.jpg
 
Hotboxbudz

Hotboxbudz

Well-Known Member
gnrfan316 said:
I got 12 plants under 3- 4ft 8 tube t5s, they're 5 weeks old and using techna flora grow, magcal and sugar daddy, stared 1/4 strength slowly worked up to 500ppm so far at 6.5 ph, the white you see is not powdery mildew it is diatomaceous earth used to kill a small infestation of fungus knats, which could ve causing my problems but i wanted to be sure. View attachment 3483428 View attachment 3483430 View attachment 3483428 View attachment 3483430 View attachment 3483431
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I would say its a cal mag problem, main stem is turning purple.
 
J

Jlpan1981

Active Member
Hey all. Im new to this site but ceased getting responses on another so here goes. Im on my second grow. Soil. Fox farms ocean floor. No nutes yet. Week three a veg 2 gal pots. Cfl and tube f louro lighting. Im not sure what is happening her . Posting pics. Hope thus was the right place to ask.
 

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Jlpan1981

Active Member
Problems started quickly at the lower leaves but this is a large middle fan leaf. New growth looks good. A little slow. But 3 plants doing this and 3 seedlings four inches tall perfect as well as one plant thats fine. Much shorter and younger than the sick ones though. Please help
 
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SSHZ

Well-Known Member
It's over fertilization..........or fertilized water splash on the leaves. But over fertilization one way or another.
 
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Jlpan1981

Active Member
Ok so my question with that is all i give them is ph'd water. No nutrients. Could it be the fox farms soil is too hot. What csn i do to help this.
 
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SSHZ

Well-Known Member
Fox Farms soil IS hot......that is a well know fact. Many people delute their soil with other's soil (like a pro-mix or sunshine #4) to help with this type of problem. I wouldn't worry about it though as the rest of your plants look fine. I'd just pluck the bad leaves now and move on.
 
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Jlpan1981

Active Member
The thing is they all looked like that at first then bam one day the tips just toast and then it spreads up as the lower leaves die. But the fiurth plant is already past the size the ither ones were when symptoms began. And not even its first leaves are burned. But i am noticing a couple tiny whitish spots on one of her leaves.
 
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