In one aspect, the present invention relates to a composition for delivery of double stranded RNA to an insect having a basic pH within its alimentary canal, wherein the composition comprises double stranded RNA adsorbed onto a clay complex, and wherein the clay complex is configured to release the double stranded RNA at the basic pH. Other aspects of the invention relate to preparations including the composition of the invention, methods of delivering double stranded RNA to an insect and methods of protecting a crop against an insect.