The maize stem borer Chilo partellus (Swinhoe) is one of the most destructive pests. This species is the most important at altitudes below 1500 meters above sea level. It's magnitude of damage ranges from 26 to 80. In young plants and shoot can be killed, causing a "dead heart". In older plants the upper part of the stem usually dies as a result of the boring of the caterpillars. Several contact and systematic pesticides are being used for its management. Therefore, it necessitated evaluating the relative persistence of pesticides commonly used against this stem borer pest for devising its economically effective management programme.