Cold Disinfestation of Zeugodacus tau (Diptera: Tephritidae) on Oranges Using Artificial Infestation Method
Jiajiao Wu, Mutao Wu, Lixia Feng, Weisong Li, Zhihong Li, Qiang Xu, Haijun Liu, Tao Liu, Sihua Yang

TL;DR
The study found that a 22-day cold treatment at 1.8°C effectively kills Zeugodacus tau fruit flies in oranges, helping to prevent their spread through international trade.
Contribution
The study provides new evidence for a specific cold treatment protocol to control Zeugodacus tau in citrus fruits, supporting phytosanitary standards.
Findings
A 22-day cold treatment at 1.8°C resulted in no Z. tau survivors in oranges.
Z. tau third instar larvae showed the highest cold tolerance among developmental stages.
Z. tau requires longer treatment times at higher temperatures for other host fruits to ensure quarantine security.
Abstract
Cold treatment has been employed since the early 20th century to ensure phytosanitary control of fruit flies in various fruits. A cold treatment protocol for Zeugodacus tau must be developed to improve global fruit trade. Therefore, cold disinfestation trials were carried out with Z. tau infesting oranges through artificial infestation. There were no survivors among 9180 individuals of Z. tau in oranges treated at 1.8 °C for 22 days. This data provided support for the application of the 22-day treatment at ≤1.67 °C as an additional safety measure. Such a measure mitigates the risk of introduction and establishment of Z. tau through imported citrus. However, for other susceptible hosts of Z. tau, the cold treatment schedules need 23 d at 1.75 °C or 25 d at 2.34 °C with larval endpoint to achieve quarantine security. These results will provide sufficient evidence for the development of…
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Taxonomy
TopicsInsect behavior and control techniques · Insect-Plant Interactions and Control · Insect Pheromone Research and Control
