瓜实蝇过冷却点的测定

Measuration of Super-cooling Point for〔Bactrocera (Zeugodacus) cucurbitae (Coquillett)〕

采用热敏电阻法对瓜实蝇1日龄幼虫、5日龄幼虫、1日龄蛹、3日龄蛹、5日龄蛹、1日龄雌成虫、1日龄雄成虫、5日龄雌成虫、5日龄雄成虫进行过冷却点和结冰点的测定。结果表明:各虫态以5日龄蛹的过冷却点和3日龄蛹的结冰点最低,分别为(-16.72±0.23)℃和(-13.14±0.55)℃;以5日龄幼虫的过冷却点和结冰点最高,分别为(-14.32±0.45)℃和(-5.52±0.47)℃;各虫态的过冷却点由低到高的顺序为:5日龄蛹<3日龄蛹<5日龄雄成虫<1日龄雄成虫<1日龄蛹<5日龄雌成虫<1日龄幼虫<1日龄雌成虫<5日龄幼虫。

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.