It is the Lily Leaf Beetle. I hand pick them on my own lilies but I've eliminated lilies from my plantings for clients. Anything you have to spray to ensure survival is a non-starter for me.
The beetle larvae are way creepier than the beetles. They coat themselves in their own excrement to avoid predation.
I suspect what you have is Bayer Rose & Flower Insect Spray. The good news is that it will kill the beetle but that bad news is that it will also kill beneficial insects like pollinators. Personally I would not use imidacloprid (the active ingredient) insecticides on any flowering plant. I believe it is now banned in Germany.
thank you. I ended up spraying the Bayer insect spray- there were so many lily leaf beetles on there I had to do something before they kill the plant. Hopefully it works and it doesn't repel other "good" insects.