Is the Sun burning my tree?

This was a bare root plum tree that grew quickly and nicely, now it appears to have burnt leaves. Is this just from the Sun?

I don't have much experience with plums, but that happens with my citrus every once in a while if there are sudden changes.....a lot of growth with cloudy conditions followed by a lot of sun, not much water followed by rains every day in the spring, a lot of growth with not enough nutrients in the soil to be taken up by the plant...

All that probably is not helpful, but I figured I would share just in case it sparks something.