柑桔大实蝇老熟幼虫和蛹过冷却点和结冰点的测定

The supercooling point and freezing point of mature larva and pupa of Bactrocera minax (Enderlein)

为明确柑桔大实蝇Bactrocera minax(Enderlein)老熟幼虫和蛹的抗寒能力,对柑桔大实蝇老熟幼虫、滞育蛹和滞育解除蛹的过冷却点和结冰点进行了测定。结果显示,同一虫态不同个体间其过冷却点和结冰点具有不同程度的变异,但其变异范围均符合正态分布。柑桔大实蝇不同发育状态间的过冷却点和结冰点均具有显著差异,其中,已解除滞育进入发育状态的蛹的过冷却点和结冰点最低,分别为-11.15℃和-9.76℃;其次为滞育蛹,分别为-8.93℃和-7.63℃;而老熟幼虫最高,分别为-7.09℃和-3.43℃。此外,老熟幼虫的结冰点和过冷却点之间的差值最大为3.24℃,显著高于滞育蛹(1.30℃)和滞育解除蛹(1.39℃)。表明,倒春寒对已进入发育状态的柑桔大实蝇蛹不会造成不利影响。

To elucidate the cold hardness of mature larva and pupa of Bactrocera minax （Enderlein） , the temperatures of supercooling point （ SCP ） and freezing point （ FP ） of B. minax at different developmental status were evaluated. The results indicated that the temperatures of SCP and FP of B. minax varied among different individuals, but the ranges of variation in line with the normal distribution. There were significant differences among different developmental status when the temperatures of SCP or EP were compared. The temperatures of SCP and FP at the post - diapause pupa were the lowest, -11.15 and -9.76℃, respectively, and then followed by the diapause pupa, -8.93 and -7.63 ℃ respectively. The temperatures of SCP and FP of mature larva were - 7.09 and - 3.43℃ , respectively The differences between the temperatures of FP and SCP at mature larval was the largest （3.24℃）, that was significantly higher than those at diapause pupa （ 1.30℃ ） and post - diapause pupa （ 1.39℃ ）.