A careful cooperative search of the vegetable kingdom by chemists and entomologists will result in the finding of new and useful compounds for the control of many destructive insects. Most of the tests for insecticidal value that have been made of plants and plant extracts are of little value because of failure to test the material upon the proper insect; failure to test proper plant material; and failure to use the proper solvent for extraction of insecticidal principles. Many plants formerly discarded as worthless will be found to have value if properly tested.