Relationships between mortalities and fruit temperatures with vapor heat, in different weights of two cultivars of mango infested with eggs of the Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae).
Yamamoto T., Sukenari S., Adachi H., Miyazaki I.
Author Affiliation: Naha Airport Branch, Naha Plant Protection Station, 174, Kagamizu, Naha-shi, Okinawa 901-0142, Japan.
Research Bulletin of the Plant Protection Service, Japan : 57-59
Abstract : Two cultivars, Irwin (366.4±14.9 g) and Keitt (761.6±49.1 g) of mango fruit infested with eggs of the Oriental fruit fly Bactrocera dorsalis (Hendel) were subjected to vapor heat treatment to examine the relationship between mortalities and fruit temperatures. Temperatures at the outermost pulp of both cultivars increased similarly during heating of air in the treatment chamber from 30°C to 50°C. They rose faster than the innermost pulp temperature of the Irwin. The Keitt's innermost pulp temperature increased slowest among the test fruits. The temperatures for achieving 100% mortality of eggs were 47.0°C at the Irwin's innermost pulp and 45.0°C at the Keitt's innermost pulp, respectively, while it was 48.5°C at the outermost pulp of both cultivars in spite of different fruit weights. These results suggest that the fruit weight has an influence on the mortality of fruit flies in fruit when temperatures are measured at the fruit core.