RM is right. Don't stress the plant by yanking off a bunch of leaves, especially since they are still useful to it.

You will need to figure out WHY they are damaged; check your pH and fertilizer numbers. You look like you are either running your ppm too high, or your pH is incorrect, or you have somehow introduced salt into your system.

IF you fill out the troubleshooting form at the top of this section, we can get that sorted for ya.