三叶斑潜蝇过冷却点和冰点的测定

Study on Supercooling and Freezing Point of Liriomyza trifolii(Burgess)

为害虫三叶斑潜蝇的检疫和防治提供理论依据,在室内对三叶斑潜蝇Liriomyza trifolii(Burgess)不同发育阶段的过冷却点和冰点进行了测定。结果表明:不同虫期之间的过冷却点和冰点差异显著,其中7日蛹的过冷却点和冰点最低,并随着蛹期的延长,过冷却点有降低的趋势。幼虫、老熟幼虫、1日蛹、7日蛹和成虫的过冷却点分别为-14.21、-16.74、-18.76、-21.97和-21.31℃,冰点分别为-12.06、-14.55、-17.07、-21.05和-20.03℃。同一虫期个体间的过冷却点虽然出现不同程度的差异,但均服从正态分布。

In this study,the variation of supercooling point（SCP） and freezing point（FP） at different developmental stages of Liriomyza trifolii（Burgess） was detected to provide theory basis for quarantine and prevention.The results showed that the different stages of Liriomyza trifolii（Burgess） had significant difference on SCP and FP.The SCP and FP in the stage of 7 day-old pupa were the lowest,which had lower trend with the extension of pupal stage.The SCP of every stage of larva,mature larva,1day-old pupa,7 day-old pupa and adult was-14.21,-16.74,-18.76,-21.97 and-21.31 ℃,respectively,and the FP was-12.06,-14.55,-17.07,-21.05 and-20.03 ℃,respectively.The SCP varied significantly among individuals in the same level,but followed a normal distribution.