Leafs dying

I had been growing cannabis for while now with great success, but i think it could be better if i can fix my problem on every of my grow. Here's i will describe my problems:
Right when it gets to week 7 to week 8 my leafs start to die, i know this is normal when it get to the harvest time, but is not norm please see attachment and please advise me. Thanks

Anyone know this problems?

What is your ppm and ph? What are you growing in?

Besides a whole ranges of nutrients deficiencies you got a bad case of spider mites.

What this guy said ^^^ .... You need to monitor your plants on the daily ... You definately have multiple issues causes your plants (leaves to look like that) I suggest going to the Library and checking out a few horticulture books and finding the solution yourself.. I'm 100 % sure you will find your answer. We all make mistakes BUT learn from them, correct and move forward Best of luck !

If your leaves stay on until week 7-8 your doing fine. Winter is coming. Plants are useing up stored energy for self preservation. Cut out calmag and nitrogen and have fun smoking the bud.

Spider mites.