Leaf issues

b3rnd · Feb 29, 2020

Hey guys,

I just spotted some leaf necrosis on my older plants. Any idea what it could be caused by?

I water when when the mix is dry. I fertilize once a week and I have a fan blowing. Temperatures fluctuate between 23 and 17 Celsius.

Edited to add: I grow in coir, and I recently switched to pre-buffered premium quality coir instead of the unbranded crap I was using before. I also ordered ferts that are specifically for that brand of coir, and I've been using it on the plants in the crappy coir as well. Could that be a factor?

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Brewster · Feb 29, 2020

LED Light burn..?

KevinThePepperhead · Feb 29, 2020

Looks like light burn to me too.

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b3rnd · Feb 29, 2020

Brewster said:
LED Light burn..?

KevinThePepperhead said:
Looks like light burn to me too.

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I agree it kinda looks like sun scald, but they aren't directly under my lights. I just have one lamp and it's used for seedlings. These are in the periphery around the lamp.

I thought I'd try to find people who posted about a problem that looks similar to mine. I couldn't find one before but I used a different search term and I found this topic. Looks almost identical and the conclusion seems to be overfertilization.

PaulG · Feb 29, 2020

Some that looks like leaf hopper damage, which
then goes into necrosis. Pics 1, 3 and 5.
I have a few plants with something similar this
season, and couldn't figure it out. Then, I saw a
leaf hopper on one plant and 'evicted' it. Haven't
had any more hoppers or spots since then.

Maybe just a coincidence?

solid7 · Mar 1, 2020

You fertilize once a week... that's a suspect statement. How much, and what?

b3rnd · Mar 1, 2020

I use Cellmax Coco Grow, at the ratio described there. Should I dilute it more or fertilize less often?

solid7 · Mar 1, 2020

I can't really tell how big your plants are, or what the recommended dosage is for a given plant size...