Study on supercooling capacity and low-temperature survival rate in Atractomorpha burri
[Objective]To clarify the cold tolerance of Atractomorpha burri population.[Methods]The supercooling capacity of each stage of Atractomorpha burri and the survival rate of young and old nymphs at low temperature conditions were determined by using the supercooling point tester in Qujing City,Yunnan Province.[Results]There were significant differences in the supercooling point and freezing point of different stages of Atractomorpha burri(P<0.05).The supercooling point and freezing point of egg stage were the lowest,which were-16.16,-8.13℃,respectively.The supercooling point and freezing point of the 3rd instar nymphs were the highest,which were-8.35,-5.20℃,respectively.The supercooling point and freezing point of male adults were-10.26,-7.18℃,respectively,which were lower than-9.00,-7.00℃of female adults.The variation of supercooling point and freezing point of different individuals in the same stage conformed to normal distribution.Under low temperature conditions,the temperature of more than 50%mortality of the 3rd and 5th instar nymphs was-7.00,-9.00℃,respectively.[Conclusion]The cold tolerance of the egg stage of Atractomorpha burri was the strongest,the 5th instar nymphs had stronger low temperature tolerance,and the cold resistance of male adults was stronger than that of female adults.
万方数据
维普
