Guava (Psidium guajava Linnaeus) is an important horticulture crop in tropical and subtropical regions. However, guava transportation to the fruit market is regulated due to the risk of fruit fly infestations. The oriental fruit fly [Bactrocera dorsalis (Hendel), Tephritidae, Diptera], which damages numerous horticulture fruits, is the primary pest in guava. For fruit export, phytosanitary treatment is necessary to prevent the potential oriental fruit fly infestations through pest-infested fruits. In this study, cold treatment was administered to eliminate oriental fruit fly infestations in guava fruits. The optimal egg inoculation density was 200 eggs per fruit, and third instar larvae displayed the highest cold treatment tolerance. On assessing the efficacy of cold treatment, none of the third instar larvae in the fruits survived at a constant fruit core temperature of 0.5–1 °C for 11 days. A confirmatory test revealed that on maintaining a fruit core temperature of 0.5–1 °C for 12 days, 100% mortality was achieved among the fruit flies. In fruit quality assessment, guava fruits exposed to cold treatment still maintained their market value. Thus, cold treatment effectively disinfested guava fruits with possible fruit fly infestations, making it a viable quarantine treatment for guava fruits prior to their export.

中文翻译：

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冷处理被东方果蝇、Bactrocera dorsalis（双翅目：实蝇科）侵染的番石榴果实

番石榴（Psidium guajava Linnaeus）是热带和亚热带地区重要的园艺作物。然而，由于存在果蝇侵扰的风险，番石榴运输到水果市场受到管制。东方果蝇[Bactrocera dorsalis (Hendel), Tephritidae, Diptera] 是番石榴的主要害虫，它危害许多园艺水果。对于水果出口，植物检疫处理是必要的，以防止通过病虫害水果感染潜在的东方果蝇。在这项研究中，冷处理被用来消除番石榴果实中的东方果蝇侵扰。最佳的卵接种密度为每果 200 个卵，三龄幼虫表现出最高的冷处理耐受性。在评估冷处理的疗效时，果实中的三龄幼虫在 0.5-1°C 的恒定果核温度下无一存活 11 天。一项验证性测试表明，将果核温度保持在 0.5–1 °C 达 12 天后，果蝇的死亡率达到 100%。在果实品质评估中，经冷处理的番石榴果实仍保持其市场价值。因此，冷处理有效地对可能感染果蝇的番石榴果实进行了消毒，使其成为出口前番石榴果实的可行检疫处理。