I hate when people take pics of just the leaf!
Pic of the whole plant.
Pic of the effected AREA.
Close up of leaf ON plant.
Lets kill THIS below, right now!
Can't call it, Only thing close I can speculate is:
Some tobacco virus like TMV
Odd that it is not across the entire strain of the same. You would think if it is a specific issue the entire strain would show signs and the other strain would not as it is not affected.
TMV and "Sunn Hemp (a bean) virus" = DO NOT EFFECT MM!!!!! Please take the time to search those here at the site. Use my name in the "By" line to filter it down,, and read what I wrote - MANY TIMES!
Please be as detailed as you can in answering these questions Mike. It gives me the info I need to help find a cause and cure.
Soil?
What soil?
List anything you amended the soil with!
What are you feeding?
List EVERYTHING going in!
How much?
How often?
This might sound dumb BUT, it's a very important question.
HOW do you mix your nutrient feed solution?
In what order?
Water source?
Have any idea the pH of the water?
Have you "flushed" for any reason?
Do you pH the in-going fluids?
To what?