A natural, cheap and easy-to-get pest repellent is flour, and it doesn’t take any water to use either.

To use it, just sprinkle it liberally over the dry leaves of the infested plant(s). Repeat after any rain as long as necessary to get rid of the bugs.

It is effective against cherry slugs (tiny little slugs that love cherry trees) and all other slugs as sliding over it dehydrates them so the go away or die.

You can use talcum powder in the same way, but the production of talc is not sustainable so flour is more ecologically sound.