A tad difficult to see details. But the brown areas look like a combination of superficial feeding (a long time ago) plus a shortage of water, probably brief and some while ago. In either instance, it's too late to do anything. For the critters, just keep a watch next year and squish when you see them. That said, the amount of critter damage in the images is insignificant for the tree's health.

More branches have started looking bad, so I snipped one off as well as a leaf that has some reddish coloring on the bottom and stopped by OTooles. They think it is blight. They recommended cutting off all the branch parts that are looking bad, disinfecting the clippers after each cut, and then hope for the best. They said spraying now might not help, and could just be a waste of money. So I gave my little tree a pretty good hair cut, taking off all the obvious bad tips as well as trimmed off the tips of all the other branches as well (partly to make it look more uniform, but also as a precaution in case those has some bit of it as well). I threw out all the branches into a garbage bag and put into the trash can. Any other tips on what I might do if it is indeed blight? From the little bit of googling I did on it sounds like it is pretty common for young apple trees, but there are some varieties that are more resistent to it (of which mine must not be!). If my tree doesn't make it after all, I'll be sure to look for one of those! I just hope it doesn't spread to my Peach and Pear trees. And speaking of my Peach tree, I'm actually wondering if that's where it came from. We bought all 3 trees last summer, and the top of the Peach starting looking bad fairly soon after planting it. But then fall/winter came, and everything went dormant, so didn't think much more about it. I did prune that part of the Peach tree several weeks ago, because it wasn't showing signs of growth. I don't remember trimming on my Apple tree after that, though, so hopefully I didn't actually do the infecting ... but not real sure. Guess it's another one of those "wait and see" situations! Marj

Paint the trunk with some old latex (white or yellow will do) paint it looks like sun burn to me, which can happen in the winter as well, when the sun is low in the sky. Sorry but I would pull that gravel away from the base of the tree out to the drip line. Rock holds the heat near the roots and reflects even more sun on to the trunk. The tree will thank you. Camp Verde

The yellow spots look like cedar apple rust to me. Best controlled by preventatively spraying any fungicide product containing myclobutanil as the active ingredient around May 10th-June 1st for your area. The easiest fungicide to get having this ingredient is Spectracide Immunox available at some Ace hardware stores or online. Nothing you can do now for the leaves already infected.