Experimental ecosystem (IMAGE) University of Zurich Caption Plants with a non-functional AOP2 gene foster the coexistence of aphids and the aphids’ natural enemy, a parasitoid wasp (pictured here parasitizing the aphid). Credit Matthias Furler, University of Zurich Usage Restrictions none License Original 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.