Old and new forms of deltamethrin (IMAGE) New York University Caption New York University researchers have created a new crystal form of deltamethrin (right) resulting in an insecticide that is up to 12 times more effective against mosquitoes than the existing form (left). Credit Jingxiang Yang, NYU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.