花生田蚜虫天敌初步调查与利用

蚜虫是花生开花下针期的主要害虫,发生严重时可减产10%-15%,其天敌主要有瓢虫、草蛉、食蚜蝇等,在莱西市以瓢虫为主。防治蚜虫应搞好＂两查三定＂,以充分发挥天敌作用。实践证明,花生蚜防治指标可掌握在百墩蚜量千头左右,瓢蚜比为1∶100-150以下。

Preliminary Investigation and Utilization of Natural Enemies of Aphid in Peanut Field in Laixi County

The aphid is the main pest during the flowering and pegging growth period that can lead to great yield reduction.The loss of yield can reach 10%-15% in the serious years.The kinds of natural enemies which performing high occurrence level and better control effects in Laixi are ladybird,lacewing and syrphus fly,and the main natural enemy is ladybird.The work of ＂Two Survey and Three Determination＂ should be well carried out in order to play a role for control of aphids.The practice showed that the control threshold of aphid amount per hundred holes was about one thousand and the ratio of ladybird to aphids was below 1：100-150.