Several classes of new insecticides have been developed in the last ten years. Many of the modes of action are new, which makes those insecticides widely effective against resistant insects. Some of the new classes of insecticides are biorational, i.e., based on natural products, while some are completely synthetic. Some are selective, while others are not very selective. Some are extremely biodegradable, and some are relatively persistent. The new classes include neonicotinoids, phenyl pyrazoles, pyrroles, spinosads, buprofezins, diafenthiurons, oxadiazines, pymetrozines, tetronic acids, and metaflumizone.