Leaf serrations curling up?

[Capulator]

The little triangular part of the outer edge of the leaf (the serrated area).. each one is individually curling up a LITTLE bit.

I think this is caused by heat stress, but I am running co2 at 1200 ppm, and at 82 degrees (at leaf surface). Humidity at %58...

Any thing else that may cause this? All my conditions seem right on.

 

[xX Kid Twist Xx]

how close to the light are they? do u got a fan blowing over the top of them?

 

[Capulator]

16" from the lights on a screen. They just hit day 22. I have good air circulation.

The leaf in the picture has air hitting it pretty good, and is about 20" from a ushio 600W, air cooled.

Not all the leaves are doing this, but I am running three strains there.

super lemon haze
tangerine dream
og 18

The lemon has done this to me before late in flowering. It did not seem to affect yeild (or maye it did, but I hit my mark so I was happy)

I also noticed a little tip burn today on a few plants so I ran a flush with just clearex (15ml /gal) and RO water pH'd at 6.0

Thanks for the help KT.

 

[sedate]

My plants do that all the time I've never been able to figure it out.

I will say, it usually seems to presage a def/lockout.

 

[Capulator]

ANY VETS OUT THERE TO TROUBLE SHOOT THIS>

I am raising the humidity right now, and flushing. Any one else please chime in on this so we can compare notes and find a solution. This is not taco/canoe leaf. its just the edges (for now). Leaves look healthy otherwise.

 

[xX Kid Twist Xx]

that is ehat and humidity related. i do not see a fan blowing over the top of them and under the light. if u put your hand right over those plants you will feel soem heat.

 

[Papa]

is it only on the leaves closest to the light?

 

[Capulator]

KT,

The "fans" are the holes cut in an 8 " air duct coming from a 10" max fan/scrubber. Its my way of not having wall fans, and it saves a little space and energy. There is definitely air blowing all over that leaf in the picture.

Humidity is now at 58%

Papa, I will check all the other leaves when the lights come on.

THANKS.

 

[basement botany]

Looks like the light needs to go up a couple few more inches. I like mine at 18 to 20 inches and I use an open air hood with a 1000 watter on a mover and have a portable ac right there and I still get a little leaf curl. If there are a few plants taller than the others even by an inch or two. I also don't use the 30 second pause feature either as this will cause heat damage to. 16 inches just seems a little close even in a air cooled hood. May have a hot spot or two there as well because of the hood. Is that Hi-E glass in that hood as well?

 

[basement botany]

Humidity is fine for that stage of development. You might want to lower it the last couple weeks of flower into the 40's. Just raise the light a bit for a few days see if they straiten out. Hows your PH and nute concentration? In my experience the light as close as possible doesn't necessaraly translate into more robust buds.

 

[basement botany]

I was also looking at those slits you cut in the flex pipe and in my opinion thats not enough. A 20 dollar fan from dollar store like the round ones turn it upside down attach it to the ceiling and point it right on the girls. Next to nothing to operate and they move alot of air. Just my opinion though.

 

[crom]

First thing I thought when I saw the pic of the leaf was too much humidity. It looks as though the leaf is trying to transpire moisture, but the environment isn't allowing it to release the moisture fast enough due to the humidity in the room. You know like the whole push and pull of fluids from the environment? Like if the room is too dry it will draw moisture out of the plants to equalize the humidity, but if it's too humid and they just got watered, for instance, the plants may be trying to "sweat" it out, but the room has enough moisture, in turn closing the stomata. Then heat stressing them? I would get at least one good fan putting a breeze on the canopy to help stir up the CO2, and disperse any heat pockets in the canopy. Just a thought, and I'm pretty medicated. Best of luck brotha!

Cheers,
Crom

 

[basement botany]

Medicated or not Crom speaks the gospel.

 

[MakinGoo]

I agree with Crom with that high heat & super high RH the plants can't sweat out the moister.. I would drop the RH the plant will b alot happier..If u don't drop the RH u will start 2 get some nute deficiencies.. Plants need 2 sweat out there moister & ur's can't sweat cuz the air is super moist

 

[crom]

Medicated or not Crom speaks the gospel.

Thank you. I'm touched! Might even benefit from a circulation fan aiming from down low blowing up through the underside of the canopy. This way the heavier CO2 gets a second chance, and cool air can force warm humid stale air up and out.

Cheers,
Crom

 

[Capulator]

I have 4" pipe in between each row with holes drilled at 6" intervals, attached to a 6 inch vortex. Co2 feeds in to the intake of each fan and blows co2 enriched air through the bottom of the canopy. I am not sure air circulation is my problem. I also have a 30" fan on the floor blasting up through my walkway.

I thought humidity may be too low from the reading I have done..Some leaves are now starting to taco a little. Just a few and like the third or fourth set down from the top of the flower.

Some plants seem completely unaffected. Especially the tangerine.

I'll go ahead and turn my dehuey back on turbo and see what that does. I flushed for 2 days, and now I am running around 1200ppms

 

[crom]

What happened right before you observed your leaves pointing up/tacoing. Tacoing could be the plant trying to cool off and have less surface area exposed to the light/heat, or it could be a Mg issue? Other Farmers thoughts on this? I have seen leaves do that towards the end of a cycle from flushing, which I believe is a Mg issue.

It's interesting what different strains do in different environments. I think it's good to note which strains did and which ones didn't do this leaf thing your experiencing. Good traits to know about for individual strains. Just a thought.

Cheers,
Crom

 

[Capulator]

Other times my plants have had this symptom was around week 7 or 8... I just let them finish out. This is day 24 or so. It seems like there could be an mg deficiency. I am noticing a couple leaves now with the necrotic spots that would be an indicator of that. 55% rh doesn't seem too high does it crom? I always run my room between 45 and 55 and plants seem fine with that. They are drinking plenty for the stage they are in and in the system they are in....

 

[Capulator]

Mn deficiency not Mg. My bad. possibly too much mag causing Mn lockout.

 

[MakinGoo]

I had a similar issue in my tent my temp was 82 & RH was 44% I got some tips turning up juss like ur's then I started gettin a lock out & 2 plants started 2 turn yellow.. I was gettin I'm guessing somd kind of iron lock out.. With a high temp plus juss barly high RH it wasn't letting my plants sweat & it was messin with the plants ability 2 absorb iron or somthin' els.. That's y my plants wernt gettin green.. RH is a very trick thing 55% could work at a lower temp but with a higher temp it throws everything out of whack.. I lowered my temps 2 78 with RH at 40% & my plants r starting 2 look better but very slowly.. So that's y I guessed ur plants were doing the same thing.. But I don't run CO2 so maybe that would change my whole theory.. I could b wrong I'm juss letting u no what happened 2 me..