利用黄板监测烟粉虱及其寄生蜂的种群动态

研究了黄板不同放置高度、不同时间内对日光棚室内番茄上烟粉虱Bemisia tabaci(Gennadius)及其寄生蜂种群的诱集监测效果。结果表明,在同一时间内以黄板上部与植株顶部持平的高度悬挂的黄板对烟粉虱和蚜小蜂的诱集效果最好,其次是以黄板上部与植株中部持平的高度悬挂的黄板,当黄板的底部高出植株顶部30 cm时对烟粉虱及其蚜小蜂的诱集效果最差。在5~10月份,随着季节的变化,同一位置的黄板对烟粉虱及蚜小蜂的诱集数量逐渐增加。调查发现,番茄上烟粉虱的寄生蜂主要为桨角蚜小蜂属EretmocerusHaldeman和恩蚜小蜂属EncarsiaF erster,2个属的蚜小蜂在季节上呈互补之势,因此总体上蚜小蜂对烟粉虱的寄生率在5~10月之间呈不断上升的趋势。

Using yellow sticky traps to inspect population dynamics of Bemisia tabaci and its parasitoids

The effectiveness of yellow sticky traps(YST) in different height and time in inspection of population dynamics of sweetpotato whitefly,Bemisia tabaci(Gennadius) and its parasitoids were studied in this work.Results showed that the largest trapping amount of B.tabaci and its parasitoids on YST was obtained when kept the top of YST in the same height as the top of tomato plants,the lesser amount was trapped when kept the top of YST in the middle of plants,and the least amount was obtained when kept YST 30 cm higher than the top of plants.The trapping amounts of B.tabaci and aphelinids on YST increased continuously during May to October. The species of aphelinids trapped by YST belonged to two genera,Eretmocerus Haldeman and Encarsia Ferster.The populations of these two aphelinids were seasonally complementary,so the total parasitism of B.tabaci kept increasing on tomato during May to October.