I went out and took off all the leaves that had suspicious signs, but I found some spider mites and their marks on almost every leaf. So I read more about spider mites and the symptoms could be very well due to them. I had a bad infestaction on mainly two plants, one of them has the drying buds I wrote about in another thread. And this could be a spider damage too.
I cleaned all that I could, now the sun is hitting the garden so later this evening I will spray an insecticide for spider mites. I would like to water, it's not raining, but still have the doubt about leaf streaks. So I can't decide what to, but probably will go ahead with the spray. Since I have to pipe water I'll end wetting leaves too, and in case of leaf streak it's not reccomended.