贵州龙里越冬代稻水象甲卵巢发育进度调查

Study on ovarian development of overwintering generation of Lissorhoptrus oryzophilus Kuschel in central Guizhou province

稻水象甲是我国重要的检疫性害虫,在贵州稻区为害面积逐年加大,局部地区暴发成灾。防治稻水象甲重点在于越冬代成虫的防治。为明确越冬代成虫的卵巢发育进度,进而确定田间的最佳防治时期,从2015年4月13日开始,针对迁入水稻秧田期的越冬代成虫采用定期解剖卵巢的方法,确定卵巢的发育程度和产卵期。结果表明,4月20日100%的稻水象甲进入产卵期。建议在此之前开展田间防控。

Lisso rhoptrus oryzophilus（Kuschel） was an important quarantine insect pest in China. Occurring area of L.oryzophilus was expanding year by year in Guizhou province and the pest broke out in some area of Guizhou province in recent years. The overwintering adult was the key stage of controuing. Based on investigation of ovarian development and oviposition period of overwintering adults of L. oryzophilus by regular ovarian dissection from April 20, 2015, the ovarian development characteristics were made clear to determine optimal control period in field. The results showed that 100% of L. oryzophilus enter oviposition period after April 20, and the optimal controlling period against L. oryzophilus was before April 20.