Had an escalation of scorpions encountered in house (and terminated) here near Austin, Texas after a lot of rain.
researched and discovered Demon WP http://pestproducts.com/demonwp.htm
Sprayed around outside home with hand pump sprayer http://www.tractorsupply.com/tsc/pro...sprayer-15-gal
No more scorpions sighted since and multiple sightings Geckos in same places sprayed.
Happy with results.