Colorado potato beetle
Extracts of "Quassia" wood or bark act as a natural insecticide. For organic farming this is of particular interest. A good protection was shown against different insect pests (e.g. aphids, Colorado potato beetle, "Anthonomus pomorum", "Rhagoletis cerasi", Caterpillars of "Tortricidae"). Quassin extract works as a contact insecticide. Adverse effects on beneficial organisms were not found.