Organic banana production in Ecuador: Its implications on black Sigatoka development and plant–soil nutritional status Maria Jimenez 1, *, Lieselot Van der Veken 2 , Heleen Neirynck 2 , Helga Rodrı ´guez 1 , Omar Ruiz 1 , and Rony Swennen 2 1 Escuela Superior Polite ´ cnica del Litoral, Centro de Investigaciones Biotecnolo ´ gicas del Ecuador, Guayaquil, Ecuador. 2 Laboratory of Tropical Crop Improvement, Division of Crop Biotechnics, Catholic University of Leuven, Leuven, Belgium. *Corresponding author: mjimenez@espol.edu.ec Accepted 6 April 2007 Research Paper Abstract Black Sigatoka, caused by the leaf fungus Mycosphaerella fijiensis Morelet, is a major constraint to banana production around the world. In Ecuador, the biggest banana-exporting country in the world, this disease has become increasingly aggressive. This has resulted in more fungicide applications, which have significantly increased costs in production and for the environment. Consequently, many banana growers have shifted to organic production, which produces greater economic returns as a result of higher sale prices. In addition, production costs are lower as no fungicides are applied. These organic bananas receive substantial amounts of organic products. This study describes the black Sigatoka disease and nutrient status in an organic banana plantation and compares it with a conventionally fertilized and fungicide-treated plantation. Black Sigatoka symptoms were evaluated in the vegetative and flowering stages under both production conditions and in vitro conditions. Univariate and multivariate descriptive statistics were used to analyze the parameters. Disease symptoms were more severe in leaves from the organic field than in leaves from the inorganic field, but the nutrient status (soil and foliar) did not differ between the two farms. Banana plants from the organic farm had 12 functional leaves at flowering and eight functional leaves at harvest. Average banana yields were over 40% lower for organic versus inorganic management; however, the average price received for organic bananas was over two times higher. Profit–cost analysis has shown that the organic banana farm was substantially more profitable than the inorganic one during the time period analyzed. These results indicated that bananas can be grown commercially without fungicides, and the lower productivity levels are compensated by higher prices of organic fruits in international markets. In addition, organic production has beneficial impacts on social and environmental issues. Key words: banana, black Sigatoka, disease symptoms, liquid and solid bio-fertilizers, Mycosphaerella fijiensis, nutritional status, organic production Introduction In Ecuador 147,282 ha—nearly 0.6% of Ecuador’s land area 1 —are used for banana cultivation. Commercial banana production takes place chiefly on the alluvial plains of the coastal lowlands in the provinces of Los Rios, Guayas and El Oro. About 10–12% of all economically active people in the country obtain some benefit from banana production. At presently, there are 5871 producers of banana and plantain. Unlike banana production in other exporting countries, production in Ecuador is not in the hands of multinational companies cultivating large areas. Instead, 80% of the total export production comes from growers maintaining areas smaller than 30 ha 1 . Black Sigatoka, caused by the ascomycete Mycosphaer- ella fijiensis, is a major economic constraint on banana production because it reduces the photosynthetic area and consequently reduces fruit filling and induces premature Renewable Agriculture and Food Systems: 22(4); 297–306 doi:10.1017/S1742170507001895 # 2007 Cambridge University Press