Need help identifying problem

[Imhereforhealing]

Great help guys thanks a lot, hope my girls survive this, I really don’t want to abandon the crop. I’m going straight to my local hydroponics shop to see what they’ve got I’ll let you know how I get on in a few days see if there’s an improvement

 

[Mars Hydro]

Hope you find out the problem and solve it.

 

[Joey2122]

Hope this helps

 

[natureman]

The problem has started on the bottom large fan leaves and seems to be spreading upwards, only 10-20% of fab leaves seem to have marks and not all of them are quite as severe.

That's not a bug problem,that's nute burn.
What are your ppm's?

 

[NOOOBIENOT]

Hello , that is definitely nute burn , the plant is way over feed , measure the ppm `s or e`c of the run off after a good flushing of just water only . can't tell by the pic the size of the plant but I am guessing that you are way over 1000 ppm on run off get it down to about 600 I am guessing at plant size here .the e`c should be less than 1.3