Kan kamchat malaengwan phonlamai (Dacus dorsalis Hendel) nai kluaihom duai rangsi gamma.
1985
Manon Sutantawong | Suchada Seksunviriya | Meechai Leungapichatkul
Hom Tong banana was artificially infested by direct inoculation with 40 oriental fruit fly eggs per each fruit. The infested fruit containing 20-hour-old eggs, 72-hour-old eggs (1-2-day-old larvae) and 120-hour-old eggs (3-4 day old larvae) were irradiated at 0.05 to 1.8 kGy with a Cobalt-60 source and stored at 26+-1C, 60-80 percent RH. The results of this experiment were as follows: (1) the LD50 for 20-hour-old eggs at 3 days after irradiation was 0.17 kGy. The dose of 0.3 kGy caused 100 percent mortality of eggs and larvae hatching from eggs irradiated at 0.15 and 0.05 kGy were unable to pupate and emerge as adults respectively; (2) the LD50 for 1-2-day-old larvae at 3 days after irradiation was 0.72 kGy. The dose of 0.6 and 0.3 kGy were required to prevent pupation and emergence, respectively; (3) the LD50 for 3-4-day-old larvae at 3 days after irradiation was 1.36 kGy. The dose of 1.2 and 0.3 kGy were required to prevent pupation and emergence, respectively. In conclusion, a dose of 0.3 kGy of gamma irradiation would be sufficient to disinfest of oriental fruit fly infested in Hom Tong banana. However, radiation at this dose also play another important role in ripening delay of fruit for 7 days.
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