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 f ly Bactrocera tryoni (Froggatt) to vapor heat treatment were determine d to find the most tolerant stage. A series of doses (fruit core tempe ratures from 39 to 46-degrees-C) of vapor heat treatment was applied t o 'Kensington' mangoes infested with eggs or one of the three larval i nstars of B. tryoni. Probit analysis of the resulting mortality showed that the stages most tolerant to heat were eggs and third instars. Qu arantine disinfestation protocols should be based on one or both of th ese stages.