Lower leaves turning yellow and brown

[Morningstar420]

Hi guys!
I very well know that lower yellow/brownish leaves are usually a pH problem or a nutrient/sunlight deficency but being new in growing I'm still concerned.
My poor baby had a lot of problems like white flies and miners (you can sadly see the effects in the photos) but after a good old neem oil showering they seems to be resolved (Ofc I still check under the leaves for eggs and I've attached yellow sticky panels to kill the survivors).
My only problem now is that the lowest and most damaged leaves are now turning yellow/brown in some spot and I cant figure out exactly why.. As I said before i get it can be a pH problem (plant does not get nutes) or quite the opposite but I want to hear more advices.
Many thanks in avance!

Ps: Also some pistils are getting brownish

 

[PK]

you can do a slurry mix to find out the ph and the nutri level of the soil. you would need a ph pen and ppm or ec reader.

 

[Morningstar420]

And if they're above the levels I do a flush?

 

[Mountainman80]

Hi guys!
I very well know that lower yellow/brownish leaves are usually a pH problem or a nutrient/sunlight deficency but being new in growing I'm still concerned.
My poor baby had a lot of problems like white flies and miners (you can sadly see the effects in the photos) but after a good old neem oil showering they seems to be resolved (Ofc I still check under the leaves for eggs and I've attached yellow sticky panels to kill the survivors).
My only problem now is that the lowest and most damaged leaves are now turning yellow/brown in some spot and I cant figure out exactly why.. As I said before i get it can be a pH problem (plant does not get nutes) or quite the opposite but I want to hear more advices.
Many thanks in avance!

Ps: Also some pistils are getting brownish

PH is off.I bet.