Most life has natural predators in the food chain .spiders have webs and catch other insects. There are various species . Your answer is to identify the spider that will trap a scorpion in its web, it will wrap it and feed it to its babys. This is a nonchemical solution. You may mix equal amounts of boric acid and mothball flakes , lightly dust the area you have seen the pest. There are benefits from pest that protect our environment.