What problem is this?

[sc1]

I have one of several strains in my garden that is showing deficiencies when I place it into the flower room. It looks like the spots first form at the bottom and then work their way to the top and to the newer leaves. Eventually the spots form into patches and destroy the leaf. I use organic nutrients. I tested the soil with a PH probe and all the plants are above 7. I feed them all with about 1 tbsp per gallon all purpose mixed with extra guano. My other plants look great.

 

[chilliwilli]

Got the same even worse looking leaf when i use the canna bio bloom fert first time at 12/12. think this is ca deficiency but i'm not sure about that. In my case it went away with the next feeding.

 

[sc1]

A month ago I had deficiencies with all my strains. But since I started top dressing at 1 tbsp per gallon every week all the other strains except that one, amnesia, are looking good. My guess is that it requires more p or k but I have thought about calcium too. My soil tester was just a metal prong 3 in 1. But the readings came out all the same on the meter, between 7 and 8.

 

[GMT]

First thing to do is drop the overall pH by about 0.5. Then take another look. You may be getting some uptake problems

 

[Dirtyeyeball]

Whiteflies

 

[sc1]

White flies? I haven't seen any. And you would say lower the PH a little with PH down. If I could find something all natural I would try that

 

[sc1]

And here is another picture.

 

[ESTERCHASER]

can i have a canopy pic of the afflicted plant?

 

[sc1]

And uptake problems. I've researched the internet a few times for high PH problems-too alkaline but have not found really anything beneficial. And as a mostly organic soil grower I have not been relying on PH up or down to regulate my ph

 

[sc1]

OK here is another picture. And I have 6 more plants just like this. All the same strain. The largest leaves are almost done

 

[sc1]

And.

 

[sc1]

All the large leaves on the bottom of the plant have turned brown and broken off. 5 of them to be exact. And I believe it's going to finish off those ones in the middle and head for the newer ones near the buds

 

[sc1]

I mean they look sort of bling except for those spots and patches. They are flowering really strong--making a nice center cola. And they do well in veg up to the transition stage. Then the spots emerge

 

[sc1]

I even flushed that particular one for two hours and then top dressed light with all purpose and that did not seem to work. So that really leaves me to believe it's something other than nutrient lockout or or PH. Maybe they are deficiencies of a nutrient or maybe it's rust

 

[sc1]

I have also considered them to be overfertilized but they aren't overly green and they arent clawing. But they do look well fed

 

[AgentPothead]

That reminds me of calcium deficiency, but it should be fine at 7ph. Magnesium and Phosphorus both get locked out around there though. I would recommend lowering your ph to about 6.5 next time you water. I've found letting it swing a little in soil, 6-7 helps make sure nothing gets locked out. After looking at more photos I would wager it's phosphorus lockout. You wanna get the ph down to about 6.5 and if you need an immediate source try to find some guano.
https://www.google.com/search?biw=1...hUKEwiQz43BkPDmAhUlrVkKHRLDDbAQ4dUDCAY&uact=5

 

[GMT]

Pop into a local pet shop and ask for some aquarium pH down and a test kit. Last time I bought the pair for a fiver but that was 15 years ago. I found the right compost so don't need to bother anymore.

 

[sc1]

Well I have 12-11-2 seabird and some 0-7-0 bat guano and a bluelab PH meter. And I have cow and fish compost. I'll havd to look for some PH down. Maybe I can lower it some with teas. Even though they say you don't need to check your PH when growing organic

 

[AgentPothead]

To quote the guy at the beginning of Star Fox. Good Luck!
https://www.youtube.com/watch?v=gjVmeKWOsEU

 

[GMT]

You don't normally need to check pH once you know you're in the right range, but its necessary to get you into the right range. If you're regularly over pH 7, then you're not really in the right range, which is why some pH down will help at the moment. You're going to need to change something, whether that's your base compost or your additives, you'll need to change something as you're a little too high right now.
Also where's your k coming from? That's essential for flowering