Beginner Gardening: I need help identifying a Tomato leaf condition., 1 by huntke

huntke wrote:
I may have a similar problem (see image), and I suspect too that it may be from fertilizer? I bought an "earth box" which came with it's own bag of fertilizer and dolomite, to be used with potting soil when the box was originally set up. Over time, more and more leaves began to look unhealthy with little white or yellow spots, eventually turning the whole leaf yellow and then dying. It doesn't look like any of the bacteria or fungal infestations that I've read about. If any expert people can shed some light, please do!