Yellow stains. Nute issue or disease?

[Lepreschone]

Hi guys,

Here are a few pics from my current indoor grow, hopefully, one of you knows what's happening.
First, some details about the grow (feel free to ask for more).
- The plants are entering 4th week flowering. Symptoms have been here for more than a week, spreading rather slowly.
- Day/Night temp.: 23°C/19°C RH: 40-60%
- Whatever it is, it's not spreading quickly and does not react to extra Ca or extra K.
- I've already grown this strain (cuttings) under these LED panels, so I'm pretty sure it's not due to genetics or lighting.
- I'm trying the Bionova Pro nutrients for the first time, following their schedule.
- The soil is the cheapest stuff I get from the supermarket, mixed with some inert stuff for draining (vermiculite, clay pellets...). They've been in that soil for a few months now and have never complained.
- The pots are 6L. The plants drink half a liter every three days or so.
- I've got twelve plants in the same setup, same pots, same feed, same soil, same strain... Only one plant is showing these specific symptoms. The plant next to it also has some lower leaves discoloration but they look different, more like your usual interveinal chlorosis. That other plant is the one that is always thirsty first. (repeat that ten times quickly!) so I guess it's still very healthy.
- I know the air flow and renewal is not optimal in my current setup. Would you say it might be due to that?
- The plants are coming from outdoors, so they've been exposed to all sorts of bugs and germs and whatnots. I've sprayed them with neem oil a couple of times since and I don't think there is any serious bug threat for now.
-Shoots/buds are not affected. Only big fan leaves, some low, some high.
- Someone suggested it might be "erwinia" but I'm having trouble finding details about that.

I think my next try will be some extra Epsom salts...

Cheers!

 

[Lepreschone]

Nobody?
Here's another from the whole plant...well, almost.
Can that be a nutrient burn? I've always thought it started at the edges of the leaves but I might be wrong.. am I?

I forgot to mention, the two pictures that look similar in my first post are a week apart. It's from the leaf that is on the right side of the apex, on top of the plant.

Cheers!

 

[Paddi]

I've got twelve plants in the same setup, same pots, same feed, same soil, same strain... Only one plant is showing these specific symptoms.

Don´t worry. Be happy. You have eleven healthy plants
Some seeds dont even hit the surface

Best growluck Bro


P

 

[Scrappy-doo]

Nute burn my friend. Some plants are just more sensitive than others. Flush thoroughly with a light nute solution. Go a bit lighter with that one in the future. The green foliage looks dark to me also. If you haven't switched over to a low N bloom formula, you need to. They won't develop buds very well with high N, and will taste like crap too.

Also, going by the recommended schedule on the bottle can be problematic. When I was using stuff in a bottle I would have to modify it. Try to find someone using the same formula with good results and copy them, or use a more common brand of nutes and read up to find successful growers using it. I had real good results using Pure Blend Pro.

 

[Lepreschone]

Okidoki.
I always tend to overfeed...
The main fertilizer, "soil supermix", is 6-5-7 plus micro, and I'm adding some P and K separately instead of the usual PK.
I'll stop the supermix and keep the P and K going after a week of plain water. Does that sound good?
I'm at 4th week flowering. I wonder if there are enough micronutes in the soil to last 'til the end. It's an early indica, 'cream mandarine'. Hopefully this time, there'll be some mandarine to it, thanks to much lower temps. My first run with it was all kush..good and powerful though, I have to say. The d-kusholene is a heat-resistant terpene, I guess.
I had around 28-30°C in the tent last time. But I moved to a separate room, this time, I'm at 23-25°C

Thanks!

Here's a pic of my last run: