2008年永福县早稻田稻纵卷叶螟发生动态及虫源性质

2008年通过调查和雌蛾卵巢解剖研究广西区永福县早稻田稻纵卷叶螟Cnaphalocrocis medinalis(Guenée)的发生动态和田间种群的虫源性质。结果表明,稻纵卷叶螟在永福县早稻田可发生4代。稻纵卷叶螟第1、2代属于基本迁入型;第3代性质较为复杂,属于本地繁殖型,既有迁入又有迁出;第4代为本地繁殖、大部分迁出型。对暴雨期间稻纵卷叶螟田间蛾量消长的研究表明,短时期的暴雨水淹对全县稻纵卷叶螟的田间蛾量消长总的影响不明显,但不同水淹情况的田块间虫量存在显著差异。还分析讨论2008年永福县早稻田稻纵卷叶螟暴发成灾的原因。

Dynamics and population characteristics of Cnaphalocrocis medinalis in early rice field in Yongfu County,Guangxi, in 2008

The dynamics and population characteristics of Cnaphalocrocis medinalis (Guenée) in early rice fields in Yongfu, Guangxi, in 2008 were studied through the systematic investigation and female ovarian dissection. The results showed that C.medinalis occurred four generations each year in Yongfu. The 1st and 2nd generation were mostly immigrants. The 3rd generation was dominated by the local colonizer, with some immigrants and emigrants. The 4th generation was basically emigrants. It indicated that heavy rainstorm did not affected the dynamics of C. medinalis adults significantly, whereas there was significant different of population of C.medinalis among the field patches with different flooding. In addition, the reasons that the cause serious outbreak of C. medinalis in Yongfu in 2008, was analyzed and discussed.