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在室内条件下,通过自主设计的起飞观测装置,利用人工模拟的黄昏环境,研究了稻纵卷叶螟Cnaphalocrocis medinalis Guenée 1~6日龄未交配成虫的起飞行为,并分别对迁出种群以及本地繁殖种群的起飞、扩散行为与日龄和性别的关系进行了测试分析。结果表明:(1)生殖隔离条件下,不同日龄稻纵卷叶螟的起飞和扩散比例存在显著差异,以羽化后24 h内成虫的飞行频率最低,2日龄是迁出种群的起飞高峰期。(2)对于夏季北迁种群而言,在首次迁飞发生期,当具备适宜的光照、温度等适于起飞的环境条件时,雌虫的起飞迁飞频率高于雄虫。(3)稻纵卷叶螟的迁飞历期较长,雌蛾产卵前期可达7.6 d,即在羽化后较长一段时间内成虫均可保持远距离飞行的潜能。(4)本地繁殖种群的起飞数量明显低于迁出种群,但仍占有一定比例,表明迁飞是稻纵卷叶螟的遗传特性,田间各代均有一定比例的外迁个体,这种种性特征不会因室内继代饲养而完全丧失。
Under the indoor conditions, the artificial takeoff observation environment was used to study the takeoff behavior of Cnaphalocrocis medinalis Guenée unmanipulated adult from 1 to 6 days, and the effects of migratory population and local Tests and analyzes were carried out on the relationship between takeoff and proliferation of breeding populations and age and gender. The results showed that: (1) Under the condition of reproductive isolation, there was a significant difference in the take-off and diffusion rates of C. medinalis at different ages, with the lowest flight frequency within 24 h after emergence and the take-off peak at 2 days period. (2) For the summer migratory population, the frequency of take-off and take-off of females was higher than that of males at the time of first migration and when suitable environmental conditions such as light and temperature were suitable for take-off. (3) Cnaphalocrocis medinalis has a long migration period and the pre-oviposition period of female moths can reach 7.6 days, that is, the potential for long-distance flight of adults can be maintained for a long time after emergence. (4) The number of local breeding population was significantly lower than that of the migrating population, but still occupy a certain proportion, indicating that the migration is the genetic characteristics of the rice leaf roller, the field generations have a certain proportion of relocated individuals, Features will not be completely lost due to indoor subcultures.