RELATIVE TOLERANCE TO VAPOR HEAT-TREATMENT OF EGGS AND LARVAE OF BACTROCERA-TRYONI (DIPTERA, TEPHRITIDAE) IN MANGOES

The tolerances of all fruit-infesting stages of the Queensland fruit fly Bactrocera tryoni (Froggatt) to vapor heat treatment were determined to find the most tolerant stage. A series of doses (fruit core temperatures from 39 to 46-degrees-C) of vapor heat treatment was applied to 'Kensington' mangoes infested with eggs or one of the three larval instars of B. tryoni. Probit analysis of the resulting mortality showed that the stages most tolerant to heat were eggs and third instars. Quarantine disinfestation protocols should be based on one or both of these stages.