Heat tolerance of first instar oriental fruit fly infested in Nang Klarngwan, Nam Dorkmai, Rad and Pimsen Daeng mangoes
1993
Udorn Unahawutti | Mana Poomthong | Rachada Intarakumheng | Walaikorn Worawisitthumrong | Pratuang Srisook (Department of Agriculture, Bangkok (Thailand). Agricultural Regulatory Div. Plant Quarantine Technical Sub-Division)
First instar oriental fruit fly (OFF), Dacus dorsalis Hendel, infested in Nang Klarngwan, Nam Dorkmai, Rad and Pimsen Daeng mangoes (Mangifera indica Linn.) were determined for their heat tolerance by subjecting a pair of infested mango varieties to vapor heat. All available evidence indicated that there were some differences in the OFF first instars susceptibility to vapor heat treatment of Nang Klarngwan, Nam Dorkmai, Rad and Pimsen Daeng mangoes. The results distinctively demonstrated that the OFF first instars in Pimsen Daeng mangoes were more tolerant to vapor heat treatment than in other varieties. The test on preparation of OFF infested fruit for vapor heat evaluation showed that the first instar larval inoculation method was the most effective. The differences observed in the OFF first instars tolerance to vapor heat treatment for different mango varieties would possibly effect the efficacy of the quarantine treatment currently used. Some OFF first instars infested in Pimsen Daeng mangoes were able to survive when an approved vapor heat disinfestation treatment temperature 46.5 deg C for 10 min at fruit center of Nang Klarngwan mangoes was applied. Thus, It was neccessary to verify the efficacy of an approved vapor heat treatment of Pimsen Daeng mangoes infested with the OFF first instars.
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