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The article reports on the study that investigates the effectiveness of farmers' chemical control of rice stem borer by the application of granular insecticide in Bangladesh. It found that the cabofuran and diazinon insecticides were not effective when applied as granules as preventive measure at half of the recommended dose. It also revealed that farmer's behavior in using insecticides against rice stem borer had no economic advantage and the irrational use of granules in rice is based on a misperception of higher yield losses from stem borers than actually occurs.