The use of copper based fungicide in the control of black pod disease caused by Phytophthora megakarya is a common practice among cocoa farmers. Copper based fungicide has detrimental effect on the environment as well as the output of cocoa production in Ondo State, Nigeria. Deviation from the recommended quantity of fungicides by cocoa farmers is not uncommon. Several studies on cocoa production often ignore these externalities. The objective of the study was to determine the environmental efficiency of cocoa farmers using detrimental variable (deviation from the recommended quantity of fungicide on cocoa farm) and traditional inputs within the framework of stochastic frontier approach. The averages of fungicide used per cropping season per hectare were 2,230 grams, 5,820 grams 10,555 grams for respondents that used below, actual and above the recommended doses respectively while average cocoa outputs were 0.92, 3.35 and 1.32 metric tons for farmers that used below, actual and above recommended doses of fungicide respectively. The low environmental efficiency did not only raise the cost of production but also affirmed that the wrong use of fungicide in cocoa farm constitutes environmental burden and make the environmental unsustainable. The study recommended that farmers should be educated on the significance and mode of application of recommended dose of fungicide on cocoa plantation.
Keywords: Environmental efficiency, detrimental input, stochastic frontier, cocoa production
