Some kind of deficiency

[rick ratlin]

I disagree, it looks like a combination P- and K- to my eyes, with the plant using up N as evidenced by the lower leaves. Nothing else about the plant's aspect/appearance says disease to me. Of course I could be wrong, but I would advise some foliar feedings.

Haggard, pH is specific to media, obviously with a limit. You are correct, if you're measuring pH in soil, you want to see it in the mid-6 range, I personally allow for as high as 6.8 when I'm measuring, and specifically in soil. When growing in coir, I shoot for 5.8-6.2, with 6.0 being a sweet spot specifically for coir.

In any event, I'm going to attach my favorite graph and graphic, two tools that I still use to this very day to help me Dx any problems. One is a pictographic of cannabis leaves in various stages and deficiencies. It does have a mistake in that Ca is listed as a mobile element, it is immobile. The other is a very simple flow chart that, while not complete, is still helpful for figuring out the 'big chunks.'

Hey Seamaiden, I noticed the bottom row of the flow chart it says toxictiy and excess. Is the middle row on the flow chart deficiencies?

 

[Seamaiden]

The chart isn't consistent in that way, it shows some toxicities but not all. So, you have to pay close attention to the notations.