摘要
为探讨苜蓿叶象甲(Hypera postica)的耐寒性,测定了不同虫态以及越冬成虫的过冷却点和冰点。结果表明,苜蓿叶象甲成虫、长翅型蛹、短翅型蛹、四龄幼虫以及三龄幼虫的过冷却点依次为-20.46、-10.34、-9.55、-10.0和-9.75℃,冰点依次为-18.24、-6.68、-6.52-、7.52和-7.86℃,各虫态中成虫的过冷却点和冰点最低,长、短翅型蛹与三、四龄幼虫间过冷却点差异不显著(P>0.05),冰点差异亦不显著;越冬期苜蓿叶象甲长翅型成虫和短翅型成虫间过冷却点差异和冰点差异均不显著;12月下旬和1月下旬雌成虫过冷却点显著低于雄成虫的(P<0.05)。综合分析认为,苜蓿叶象甲各虫态中以成虫耐寒能力最强,翅型对苜蓿叶象甲的耐寒性影响不显著,性别对苜蓿叶象甲耐寒性的影响因气温的降低而差异显著。
Supercooling point and freezing point in all stages and overwintering adults of Hypera postica were measured in a laboratory population.The results showed that the mean supercooling point of adult,normal-wing pupae,vestigial-wing pupae,4th and 3rd instar larvae were-20.46℃,-10.34℃,-9.55℃,-10.0℃,9.75℃,respectively while their freezing point were-18.24℃,-6.68℃,-6.52℃,-7.52℃,-7.86℃.The suppercooling point and freezing point of adult were the lowest.There were no significant differences between pupae and 3rd,4th larvae in suppercooling point and freezing point.The difference of adults which were in different wing-type was not significant.During late December and late January,the supercooling point of female adult was lower than male adult.Thus,it revealed stronger cold hardness in adult stage than in other stages.The effect of two wing types were no significant differences,and the sex brought significant differences with the temperature decreasing.
出处
《草业科学》
CAS
CSCD
北大核心
2011年第3期459-463,共5页
Pratacultural Science
基金
新疆草地资源与生态自治区重点实验室基金(XJ-DA0209-2007-06)
现代农业产业技术体系建设专项资金(nycytx-37)
关键词
苜蓿叶象甲
耐寒力
过冷却点
冰点
Hypera postica
cold hardiness
supercooling points
freezing points
