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| Measuration of Super-cooling Point for〔Bactrocera（Zeugodacus）cucurbitae（Coquillett）〕 |
| LIU Kui, FU Yue-guan, HE Sheng-yang, QUI Hai-yan |
| Environment and Plant Protection Institute, Chinese Academy of Tropical Agriculture, Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Danzhou 571737, Hainan, China |
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Abstract Thermistor method were conducted to examine the super-cooling point and freezing point for adult, larva and pupa of Bactrocera（Zeugodacus）cucurbitae（Coquillett）. Results showed that the super-cooling point of 5 day-old pupa and freezing point of 3 day-old pupa were the lowest, which was（-16.72±0.23）℃ and（-13.14±0.55）℃, respectively. The super-cooling point and freezing point of the 5th instar larvae were the highest, which was（-14.32±0.45）℃ and（-5.52±0.47）℃, respectively. The sequence of super-cooling point from low to high is 5 day-old pupa＜3 day-old pupa＜5 day-old male adult＜1 day-old male adult＜1 day-old pupa＜5 day-old female adult＜the 1st instar larvae＜1 day-old female adult＜the 5th instar larvae.
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Received: 21 November 2010
Published: 07 March 2011
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