Hi Sue, here's a great video that will show you how to make homemade bug spray - https://www.youtube.com/watch?v=QsCZB-f8iZY
Try this also: https://www.hunker.com/13405830/homemade-bug-killer-for-hostas
Hostas usually only have big issues with slugs. Putting a low cup of beer or salt will stop them.
So will Large cans with both top and botton cut out I let mine get really rusted Set it over the small plant it grow right out of it but leaves a ring NO SLUGS EVER