mango fruits of `keitt', `tommy atkins' and `haden' cultivars, infected with larvae of the mediterranean fly ceratitis capitata (wied.), were submitted to hydrothermal treatment at 46.1oc. the fruits were classified in two weight ranks, 450g to 650g and 651g to 800g, kept in the water for 75 and 90 minutes, respectively. the number of dead larvae was obtained from 75% of the infested fruits. the 25% remaining fruits were kept as control. larval mortality was observed to be 100% in the fruits infested with first and second instar larvae. four and three adults survived in the fruits which were infested with larvae of the third stadium, and weighted above 540g and 730g, in the immersion periods of 75 and 90 minutes, respectively.