Let me preface this post by saying that I live in the NYC area.
The D'Anjou dwarf pear tree that I got 3 weeks ago was planted last week. For the two weeks it sat in my backyard, it was just hanging out in the pot it came in. The tree was green and vibrant and has a good number of flowers. Over the course of the two weeks, I've periodically watered it giving it a good amount of sun. During that time, the leaves began to turn a duller green with two parallel orange lines extending from base to tip. Petals also fell off and the fruit has been growing. Noticing that the leaves began to change... I immediately planted it in the ground with the recommend compost + mulch layered on top. The tree has been stable since then. The vibrant green hasn't come back. The leaves continue to appear more droopy than when I first got it. The fruits are still growing and look fine. However, some leaves have become black. Any ideas what this could be? I'm worried it's fireblight, but I'm no expert. I've attached pictures. Please help!