Evaluation of Vapor Heat Treatment for Control of the Oriental Fruit Fly and the Melon Fly in 'Nang Klarngwun' Mango

Abstract

Vapor heat treatment was developed as a quarantine treatment for 'Nang Klarngwun' cultivar of mangoes, Mangifera indica L. It was tested against eggs and larval instars of the oriental fruit fly, Dacus dorsalis Hendel and the melon fly, D. cucurbitae Coquillett.
Among immature stages of the both fruit fly species, the most resistant developmental stage to vapor heat treatment was 1st-instar larvae of the oriental fruit fly. There were no survivors from estimated treated population of 99,252 individuals of 1st-instar larvae of the orientl fruit fly when the innermost fruit temperature was raised to 46.5 C and 98% R.H. respectively. At a fruit load factor of ca. 150.0 kg per cu.m., an approach period of ca. 110 min. was necessary to raise innermost fruit temperature of all teh fruits to 46.5 C.
The vapor heat treatment disinfested 'Nang Klarngwun' cultivar of mangoes without affecting either quality or shelf life.