The Xerces Society's new Searchable Systemic Insecticides List allows anyone to understand the dozens of insecticides currently registered in the U.S. that are designed to permeate plants from within. Systemic insecticides can render some or all of a plant toxic to insects that feed on plant tissue and are commonly used to suppress herbivorous sucking or chewing insects like aphids, caterpillars, and root nematodes. Unfortunately, systemic insecticides also harm beneficial insects.