Any idea what's doing this to the leaves?

[Delps8]

I don't have a way to properly control humidity and I've trying to keep temps as indicated below. btw, i'm at most 10-11 days from changing to flowering. If you say the plant is probably taking up too much nutrients they I can maybe feed them once a week. So you think this is not a fungus or other issue?

(Cannabis Temperature Tutorial | Grow Weed Easy)

Your RH is very low so a fungus/mold is highly unlikely.

How did you check for mites? As clearly demarcated as those spots are, I'm wondering if it's thrips. I had those a couple of years ago. Below is a photo of a damaged leaf. Unfortunately, it's the only photo I've got but the clearly defined margins of the damage on your plant "clicked".

If you have a loupe, turn over your leaves and use the 60x lens. Thrips leave little "honey" colored deposits on the leaves. Also below, is a photo of a live thrip.

They attack very quickly so, if you have thrips, get a bottle of Spinosad and drench the leaves, top and bottom. "drench" meaning spray everything until the Spinoza drips off the leaves.

 

[dba1954]

I'll get my macro lens out for my camera and look tonight, thanks

I'm assuming both the top and bottom of the leaves have to be sprayed?

 

[013]

critters hang out, mate and attach eggs on leaf undersides, we spray undersides first cuz if you do the process backwards then all the foliage is drooping downwards from wet leaves and you get bad coverage with your spray efforts

Mix your potion according to manufacturers instructions, shake well and while spraying shake often.. adjust sprayer to use the finest spray mist possible…

easy way to remember how to spray is… always go up her skirt first… yep elevate plant on a high table and spray leaf undersides first.. get stems and stalks too, once the undersides have been thoroughly coated then lower the plant and spray from top down on the outside…

 

[Delps8]

I'll get my macro lens out for my camera and look tonight, thanks

I'm assuming both the top and bottom of the leaves have to be sprayed?

Don't know if a macro will do it. In the photo I posted, that's an adult thrip so they're very small. I used a $9 loupe from Amazon. The loupe is good for checking trichomes, as well as bug hunting. The photo I posted was taken with an older iPhone + putting the loupe over the camera lens. I have a Nikon 105 macro and, IIRC, that doesn't have the magnification.

Yup, top and bottom. I've had two thrip infestations and, in response, changed the schedule for my Spring grow so that it's done by mid-May. They're nasty little bastards and twice was enough.

 

[dba1954]

i can get up and close, need daylight though example

 

[Gru]

I’m not a doctor or play one on TV but:

If you took your pics while they are under your grow light, they seem quite green.

Too much nitrogen can cause calcium problems.

 

[Sueet]

I’m not a doctor or play one on TV but:

If you took your pics while they are under your grow light, they seem quite green.

Too much nitrogen can cause calcium problems.

You're that guy that stole the moon, right?

 

[MochaBud]

something is going on with my girl, This looks different then my first problem, It's 49% humidty, 79.5f. I just sprayed with a fungicide/mite killer but don't see any mites top or bottom...

Looks like something's chewing on your lady there ya when I started growing, I had bugs, mold, PM, mites and some more shit here's a list of things to get for a stress free grow room

1) a humidifier
2) a dehumidifier, mine is a portable AC/dehumidifier
3) small oscillating fans at least 10 inch
4) at least a 400 watt light, either HID or LED
AND the most important thing in my arsenal "Beneficial Nematodes" I pre-treat my soil before I even plant anything in it, and they will kill anything that lands, walks, or crawls across my soil, get ya some, I guarantee you will have no more bugs...36 bucks once a year, I can water my soil, and I use it outside the house, so I can sit on my deck and enjoy a BBQ without a shit ton of bugs look them up, here's a pic...

Beneficial Nematodes.JPG

• MochaBud
• Apr 26, 2021

Beneficial Nematodes.JPG

• MochaBud
• Apr 26, 2021

 

[safeman]

what about "nutrient splash" when feeding you splash nutes on leaves -- just a thought

 

[dba1954]

what about "nutrient splash" when feeding you splash nutes on leaves -- just a thought

i was getting this during the first 4 weeks without nutrients but thanks

 

[dba1954]

no bugs but the ph was 6.95for the nuts and 7.2 for the water. It turned out my PH meter had bad batteries (leaking), I replaced , recalibrated and adjusted the water and nute solutions to 6.31 and 6.32 respectively. Not sure if that could have been my problem.

 

[013]

Great job on catching the bad batteries and recalibration!!! Yes the ph needs to match the grow media used… for hydro, hempy & coco platforms aim for 5.8 but absolutely for soil 6.3 is your target.

The ph deal will help greatly but still need to deal with crotch critters…

 

[dba1954]

the plant isnt getting any more spot!!! I started the proper PH adjusted water/nutes yesterday, looks very healthy. It also grew 3" this week so far so I flipped to 12 hrs of light today

 

[dba1954]

i cut the nutes back by 1/2. This foxfarm ocean soil seems hot. Super dark green

 

[Sueet]

What the heck is going on there on the top? Is she growing that way, or did you chop those leaves ? It looks grown, but I haven't seen that sort of odd growth before.

 

[Landracey]

Great job on catching the bad batteries and recalibration!!! Yes the ph needs to match the grow media used… for hydro, hempy & coco platforms aim for 5.8 but absolutely for soil 6.3 is your target.

The ph deal will help greatly but still need to deal with crotch critters…

Hi 013, do you have a source for that 6.3 soil target? It's just that I've been reading 6.5-7.0 to be optimal. I've worried about this before because tapwater around here is about PH9 with lots of additives, so I just give them spring water, which is 6.8 according to producer

 

[Buckets420]

The plant is 4 weeks old and light is @20,000 lux. It's growing in foxfarm ocean soil and I have not started using fertilizer. Is this too much light? The leave effected are the plants lowest (first) leaves.

I am guessing humidity needs to be higher from the looks but could be wrong. Another person mentioned the light being to close. I generally start with the basics like the environment but that's me.

 

[SmokingWings]

i cut the nutes back by 1/2. This foxfarm ocean soil seems hot. Super dark green

It is possible that the dark green color is normal for that plant.

I can have two plants, different strains, side by side on the bench or in the flowering tent. Both getting the same fertilizers at the same dose. One will show darker green leaves than the other.

 

[SmokingWings]

What the heck is going on there on the top? Is she growing that way, or did you chop those leaves ? It looks grown, but I haven't seen that sort of odd growth before.

Kind of looks like a "fimming" situation where the ends of the leaves in the growing tip were pinched off. Sort of a "..I missed..." event.

 

[dba1954]

Kind of looks like a "fimming" situation where the ends of the leaves in the growing tip were pinched off. Sort of a "..I missed..." event.

yup