Sick tree. Help, please!
Hi, I am an absolute novice in gardening and to be frank I couldn't tell a tree from a bush. I wonder if anyone can help me identify the issue with my tree. It's not leaving properly and I fear it's suffering either from a disease or malnutrition or an infestation of some kind. It's leaves are not properly formed on most branches. I have added some pictures. The nearby plants are starting to show similar signs so it makes me think that it's spreading and I need to cut down the tree to save the garden. Any advice on what this might be and how I can fix it would be much appreciated. Also if someone can tell me what type of tree this is it would be most welcome.