Careful if you spray in this heat. I did some damage because I had no choice but to spray on a 90 degree day. I did use some sevin powder in the heat to take care of some japs and it did not hurt the leaves.
I used Imidian and it seems to work beautifully, I do add some sevin to my mix. I even used it on my potato plants because the tator bugs were bad this year.
I have the same problem on one of my trees (Could actually see a few beetles on them). Was curious if age had much to do with what I could spray on it - looks like your tree is similar in diameter to mine.
I spray my new 1st year grafts the same thing I do with my older trees, I do not believe it makes a difference on 'age'. Its all about temperatures outsides and wind drift.