You can kill insects with soap and water

Get an empty spray bottle, fill it with Dawn dish soap a little bit maybe like a near half way, and then fill the rest with water.

Insects breathe through their bodies not their mouths, so when you spray them with soapy water, it clogs their breathing mechanism and suffocates them. You can do this with wasps spiders, stink bugs, and I'm pretty sure this would also work on lantern flies.