Browning of the leaves

[munze]

Hi, I’m having this problem and unable to identify what it can be.

Any ideas? ThanksView attachment 1002007

 

[Beachwalker]

What kind of Lights how close are they and what's your temperature

 

[munze]

Here are some more pictures. End of week 8. SFV OG

 

[munze]

What kind of Lights how close are they and what's your temperature

It’s in a Greenhouse, had upper 90s temperatures these days. I’m in Norther California.

 

[Beachwalker]

I'm more familiar with indoor, maybe an outdoor grow a will chime in; this looks similar, but doesn't mean it's the same thing, this is caused by overwatering and high temp

The more info you can post the better, like medium pH frequency of watering nutrients excetera

 

[munze]

Yes, so more info. It’s a grow in beds, soil, using Canna nutrients. Kept ph around 6 and in flower around 6.2-4. I’m attaching the photo of the last two weeks of feeding and states which day of week it is.

Thanks for some ideas @Beachwalker

 

[Beachwalker]

So I read the thread from that article it had high temperatures pH issues and was questionable drainage

Upper Leaves Rust Spots and Crispy ... Pics

Hey there GC. I posted this on the sick plants thread and I got some good feedback, but I would like to get some more opinions since the problem...

forum.grasscity.com

almost looks like magnesium but it's up top, and it's not light burn cuz it's a greenhouse ..have you done a slurry test?

 

[munze]

So I read the thread from that article it had high temperatures pH issues and was questionable drainage

Upper Leaves Rust Spots and Crispy ... Pics

Hey there GC. I posted this on the sick plants thread and I got some good feedback, but I would like to get some more opinions since the problem...

forum.grasscity.com

almost looks like magnesium but it's up top, and it's not light burn cuz it's a greenhouse ..have you done a slurry test?

What I did about a week ago, I took a soil sample and ran some water through it. I recorded the water ph and ppm before and then I recorded the runoff. I did get the soil sample from the top of the bed. No crazy fluctuations. I am thinking I’ll try the slurry test with a soil sample from bottom of the bed.

Another thing that crossed my mind was Cal deficiency but I am not sure. I’m only giving them water today just to be in the safe side.

 

[Beachwalker]

You've got to use either distilled or RO water

 

[munze]

You've got to use either distilled or RO water

I just did the same thing with distilled water. I took a sample in a cup and ran distilled water through it. Distilled was around 5.4 ph, 0 ppm. This was my result measuring the runoff. I am doing the slurry test now.

 

[munze]

Slurry test showing the following, using distilled water.

 

[GNick55]

overwatering

 

[munze]

overwatering

Thanks for your input GNick55. Do you suggest that leaves have too much water in them and high temp/sun would hit them and cause them to burn in certain spots?

Another note, this is not happening on lower leaves.