Please help! Does anybody know what this is?

Hey guys, it's not often that I cant figure out a problem with the girls.

Stage: Flower week 3
Medium: coco/perlite 3 gal smart pots
Strain: BigBud
Watering schedule: every 3 days 15% runoff
Ph in: 5.6-5.8
Ph out 6.2
Light: 10 x cree CXB3590 1400ma 20inches AC
Nutrients:
- GH Flora nova bloom
- GH Calmag
- GH KoolBloom
- GH Floralicious Plus
(900ppm)

12 plants in total

Hopefully that's enough info let me know if theres anything else needed.

The plants started suffering 2 days ago and it happened overnight, before I watered them.
My environment is kept around 23 - 25 degrees at 60- 70 percent humidity.

The leaves have curled up and they have brown stripes down the leaves starting from the top and working their way in.

I have never had this problem before, I can rule out any heat stress.

Hi Nevadao,
You didn't mention water. Tap or RO? Ph and ppm of tap?

And just looking at things...what strikes me is that you're using coco/perlite as if it were soil. With that medium you could water 6 times a day and not be overwatered. Yet you're giving it a drying cycle. I'm going to wait on the water info...
JD

PS Do you check ppm and ph on overflow?

Move that light up a bit.

Just some thoughts.

Any Reason you're not using a "Micro" Nutrient. (Ie: Micro, Grow, Bloom).
You can get away without a Grow, but you would want some Micro.

Also don't go too hard on the KoolBloom or the Floralicious, they are fairly concentrated.

Do you find the pots are fairly light after the second day? (If so you could water sooner)

I am using rain water, it's about 40-80ppm from the tank, I wat er r when the pots feel light to avoid any root problems, I dont use a micro because the flora nova line has micronutients in each part instead of the normal flora line.

JohnDee said:

Hi Nevadao,
You didn't mention water. Tap or RO? Ph and ppm of tap?

And just looking at things...what strikes me is that you're using coco/perlite as if it were soil. With that medium you could water 6 times a day and not be overwatered. Yet you're giving it a drying cycle. I'm going to wait on the water info...
JD

PS Do you check ppm and ph on overflow?

Click to expand...

i must comment on this do you grow in coca do you water 6 times a day.
i grow in coca and if i water 6 times a day not that anyone would but it will over water the plant
i was watering 3 times a day at one point and plant always looked over watered
i agree watering every 3 days is not enough but saying you can water 6 times a day doesn't sound right at all
maybe if you have like 80% perlite
i use 60 per 40 coca and i cant water more then 2 times a day in flower with out plant looking over watered

Kipn said:

i must comment on this do you grow in coca do you water 6 times a day

Click to expand...

Kipn,
There are guys all over doing coco as a hydro medium. This is totally nothing new. But this particular reference popped into my head because I've been reading a huge thread by a guy named Don Juan Matus (DJM) over at ICM. He grows trees in coco feeding 6 times daily. So go argue with him. lol

https://www.icmag.com/ic/showthread.php?t=300255

Cheers,
JD

If my VPD is high I water every 2 days, if m th humidity is higher I will water every 3 days, I'm using a 70/30 coco perlite mix, when the root mass fills the pots more I will water more frequently but I will be causing more harm than good if I watered more than once a day

im sure the amount you are watering isnt the problem too many nute too hot if i feed my plants 900ppm they burn but dont look like nute burn more too much cal mag or bad ph
have you ever feed your plants with just water and have you ever checked ppm or the run off you are feeding in 900ppm but i bet you have 1500 plus coming out
i find if i water for several weeks with out giving a good drink of water i get tip burn
if you feed eposn salt sometime that can burn up your plants really quick
i say feed just ph water for 1 feeding out of evey 3
since the plant is already budding i wouldn't fuck with it too much just flush and continue feeding half of what you are feeding and hope it comes back
moving the light up couldn't hurt ill help them recover
i would cut out cal mag for a few feeds
take my comment with a grain or salt

hotrodharley said:

Move that light up a bit.

Click to expand...

Hello? 10 COBs?

"If in doubt, keep LEDs further away – It's very common for cannabis growers to believe that as long as the temperature is under control they can keep LED grow lights as close as they want. Unfortunately this is not true. Although LED grow lights run cool, the LEDs available today give off an intense amount of light which is great for yields, but can give your plants light burn if kept too close.

The reason this can be such a problem with LEDs is it can take a few weeks before your plant really starts to show symptoms. Usually the upper leaves are affected first (yellowing or turning brown or spots) by too-close LEDs, but symptoms can also affect other parts of the plant."

Move that flippin' light up to about 30".

Jesus H. The chain, man. The chain.

Thanks for the help guys really appreciate it, my next watering will be 5.6 no nutes and I'll move the lights up to 30 inches!