what cause yellowish and rust spots?

Greetings randomgoat. First things first all I can focus on is the leaf miner that has neatly burrowed its way through your lovely leaf. This will definitely be a stress factor. I would remove the offending leaf immediately and hopefully remove the nasty critter. Neem is a good solution. Hope it helps. Sticky buds!

Thanks a lot for the answear Shinsimilla

The paler new growth is normal, especially if you look before sunrise. A lot of new growth has not seen light, so hasn't had time to do any photosynthesis. As long as it isn't drastically lighter, it's normally a good sign. My guess for the burned spots is that when you sprayed, some drops clung on to some of the serrations. Then one or 2 things could have done the damage. 1. As the drop dries the pesticide concentration gets higher to the point it can burn the leaf. 2. The sun hit the plant before it was completely dry and those drops act like a magnifying glass and concentrate it on the leaf and burn it. I avoid spraying pesticides and rather try to find predatory mites that eat whatever pest is giving you trouble, it is much more effective and pretty much no stress for the plant.

Thanks a lot growingGrannie I do have bio bloom from biobizz, Should I give that to my plant, if it's potassium it needs? But what Cause the yellowish leaves, is't Also potassium defiency?

The brown straight tips is potassium deficiency. If the tips were brown and curling up, it would be nute burn. Without a diary, we can't tell you how to remedy this and we don't know what you're doing that would cause this... Start a diary! It will help us help you more the next time you have a question or an issue comes up. Good luck.