Control of these insects by seed treatments is reliant on either the adults, in the case of cypermethrin, or larvae, whentriflumuron is used, feeding on the treated grain and hence the insecticide. When feeding on treated grain, insecticide is ingested and the insect is killed. Eggs and larvae feeding exclusively within the seed are not controlled by this method, as there is no intake of chemical. However, when they emerge, insecticide is ingested from the surface of the seed and control is achieved.