Supercooling Points and Freezing Points of Carpomya vesuviana Costa

The supercooling points and freezing points of all stages of Carpomya vesuviana Costa were determined in order to study the cold tolerance of it.The supercooling points were different at each development stage and also different among individuals in the same stage.Supercooling points and freezing points decreased with the instar of Carpomya vesuviana Costa adding.The mean supercooling point of the 3rd instar larvae was(-9.75±0.64)℃ and the mean freezing point was(-5.53±0.46)℃.The mean supercooling point of the 30day-old pupae was(-22.71±1.21)℃and the mean freezing point was(-17.01±2.34)℃.The mean supercooling point of the 1day-old pupae was(-7.28±1.08)℃ and the mean freezing point was(-5.49±0.56)℃.The results presented that the supercooling point of Carpomya vesuviana Costa was low and its cold hardiness was great,which indicated its widely potential distribution in most jujube growing zones of China.