Leaves Curling Up, Don't think it is heat stress.

[pennywize]

Hey guys,
I have been struggling to figure out why these fan leaves are curling up so hard. It has been like 2 weeks of this. Temps are under 70-80 at max, and humidity is at 65%. I am roughly 7 weeks into flower.

 

[ShroomKing]

Looks like sever heat stress to me. What's temps at canopy level ? I've had them curl up like that from over feeding too, just not that bad. Hope your harvest is not effected. Best of luck !

 

[stickyfing3rs]

What's your humidity fluctuation between lights on and off?

 

[pennywize]

I have a temperature probe at the canopy level, it is reading 75. The humidity has stayed at about 60-65% day and night

 

[pennywize]

I have also put a fan right above that specific canopy to try and reduce any heat that might exist. I have an 4 inch exhaust fan and AC

 

[toquer]

VPD it is then. That excess air movement is creating negative pressure above the plant. Focus the air higher up and blow the heat around. Should help open those leaves back up.

 

[pennywize]

So excessive air directly on the plant can cause this?

 

[stickyfing3rs]

 

[ShroomKing]

Here is a link that describes vpd in easy terms to understand was for me anyway. Just ignore the data relating to Thier vpd monitoring system. Best of luck !

http://www.arguscontrols.com/resources/VPD_Application_Note.pdf

 

[pennywize]

Thank you

 

[ShroomKing]

Another question. What type of lighting are you using ? Glass hoods ? Etc?

 

[pennywize]

air cooled raptor 6

 

[ShroomKing]

air cooled raptor 6

Ok. It's not light spectrum I'm sure. If it was me I would flush immediately. I'm more inclined to think if it's not heat , and heat THAT bad would burn more. I think you may have salt build up. A good flush will not hurt and will show you recovery in hours if it is. Best of luck. Keep us posted.

 

[pennywize]

I been using Nectar for the Gods nutrients, all organic. I was under the impression these nutes aren't a bunch of salts that can build up like that.

 

[pennywize]

Here is a pic of the Space Candy, same tent

 

[ShroomKing]

I been using Nectar for the Gods nutrients, all organic. I was under the impression these nutes aren't a bunch of salts that can build up like that.

I've not studied or used NOG. But give her a good flush and find out. You might be surprised. Lots of "organic" products have organic salts these build up over time and cause havoc. Peace

 

[ShroomKing]

Here's some users of NOG saying FLUSH it !!

 

[m8ty]

What about root aphids do you see any crawling around in the roots?

 

[pennywize]

I don't believe I have any aphids but I had a problem with fungus gnats, sprayed azamax a few times, seemed to help