What you’re seeing is the tree-of-heaven run wild. How do I kill this thing forever???

Side note, there were three full grown trees in our yard. We chopped them down in hopes that it would lead to a decline in the spread of this virus. Instead, now that the shade from the trees is gone, it has supercharged growth from saplings. How do I scorch earth my backyard of this demonic tree? I want to create a eco oasis with all kinds of native wild flowers and native fungi, but I can’t do so with this landscaping demon.