Whats going on here?

[jdog127]

Can anybody tell me what's going on here.
My best guess is it's light burn. I've got a dual 900 watt meizhi LED dual specs, with bloom and veg light both turned on. 20" from light to top of plants. Temps flux between 73-78. RH around 40% most often.

5/8th FFOF and 3/8th coco
Water with PH corrected Tap water to middle 6ish
Added:
molasses
1/4 strength cal/mag
3/4 strength mycorrhizae
1/4 strength grow big
1/4 strength super thrive

 

[WinterSoldier89]

Cal-mag, add some more.

 

[jdog127]

Cal-mag, add some more.

You really think it is a Cal mag issue even though I used tap water and add 1/4 strength Cal mag?

 

[Roger A. Shrubber]

i'm not entirely sure what that is, but it does not look like a deficiency to me...looks more like mechanical damage, maybe some kind of insect? (but i'm damned if i can think of which one).....it looks like the top surface of the leaf has been damaged....almost like thrip damage, but the pattern doesn't look like thrip damage....¿

 

[Roger A. Shrubber]

https://www.growweedeasy.com/cannabis-plant-problems/thrips

 

[R Burns]

This is a calcium issue, but because your temps and rh are too low. Should really be in the low 80s with led.

 

[jdog127]

This is a calcium issue, but because your temps and rh are too low. Should really be in the low 80s with led.

Mid 80s really? I was always under the impression that mid 70s was ideal. And why does temperature matter when it comes to the type of light I used? Why is mid 80s I deal with leds vs HIDs.

 

[macsnax]

Mid 80s really? I was always under the impression that mid 70s was ideal. And why does temperature matter when it comes to the type of light I used? Why is mid 80s I deal with leds vs HIDs.

There's no radiation that raises leaf temp like HID gives. It all about transporation, how the leaves breath. To get leaf temps up similar to what the radiation of HID gives, raise your room temps up to 82f with led.

 

[Roger A. Shrubber]

the surface temperature of the leaves is what is actually important...h.i.d. lighting produces more radiant heat than leds, which heats the leaf surface more, so you need to stay in the 70s to maintain the proper leaf temp...with leds, you need to stay in the low 80s to keep the surface temps in the optimal range

 

[Roger A. Shrubber]

and i don't think this is a calcium issue.....

 

[macsnax]

the surface temperature of the leaves is what is actually important...h.i.d. lighting produces more radiant heat than leds, which heats the leaf surface more, so you need to stay in the 70s to maintain the proper leaf temp...with leds, you need to stay in the low 80s to keep the surface temps in the optimal range

Lol

 

[Roger A. Shrubber]

jinx....

 

[R Burns]

Mid 80s really? I was always under the impression that mid 70s was ideal. And why does temperature matter when it comes to the type of light I used? Why is mid 80s I deal with leds vs HIDs.

So I wrote low 80s. But the way that plants are using led light requires more calcium for nute uptake. In order to get more cal, you have to increase transpiration. Increase the temp and you increase the transpiration. Learn to use your rh in conjunction with your temps (vpd) and you can be even more efficient.

 

[macsnax]

jinx....

Guess I owe you a coke man

 

[jdog127]

@Renfro
Got any ideas bud?

 

[Powertech]

Looks like some kind of bug damage, or perhaps you got a few drops of something onto some leaves?

 

[Renfro]

@Renfro
Got any ideas bud?

Are those spots dry or different in texture?

 

[jdog127]

The spots are dry but not crunchy dry and feel smooth to the touch as opposed to the unaffected areas around it. And the only 2 bugs I have had slight issues with is your standard housefly and those pesky little fruit nats. But all have been minor issues as I have numerous glue traps and glue ribbons around my grow. And the spots are less than 24 hours old.

 

[jdog127]

Looks like some kind of bug damage, or perhaps you got a few drops of something onto some leaves?

Water on the leaves could be a likely culprit. When I water I try to do my best to keep the water off the leaves but sometimes it's inevitable it's going to happen.

 

[jdog127]

I don't know if this plays in to the spots on my leaves Which are my mid level fan leaves, but my new growth looks a little wrinkly. Does the plant as a whole look normal to you guys.
Sorry bout the purple. And you can see in the big picture that the spots Are kind of luminated by the purple light. And the spots are less than 18 hours old they came on kind of fast so I guess we'll see what the next 24 hours holds.