云斑天牛在白蜡树上的发生与防治研究

云斑天牛Batocera horsfieldi(Hope)是白蜡树上近年来新出现的一种蛀干害虫。在东营市的市区绿化中危害日趋严重，目前其受害率达到10％强，成为白蜡树上继“窄吉丁虫”为害后的又一主要蛀干害虫。该虫2—3年完成1代，以第1年幼虫和第2年成虫，在主干或主干分叉处的蛀道内越冬。主要危害胸径8cm以上生长的白蜡树，在树干根基部30cm以下，或在主干分叉处蛀食为害，并常引起“风折木”。在9月下旬进行注药和4月上旬进行埋药防治，控制效果可达90％以上。

Occurrence and control of white-stiped longhorn,Batocera horsfildi (Hope)(Coleoptera:Cerambycidae) on Chinese ash, Fraxinus chinensis Roxb.

The white-striped longhorn Batocera horsfildi (Hope), one kind of trunk borers, newly damages Chinese ash Fraxinus chinensis Roxb. recent year. It has become an important borer on Chinese ash, with more than 10 percent of damage rate and becoming more and more serious, following another kind of borers Agrilus sp. The longhorn has one generation per 2 to 3 years and overwinters in larvae of the first year and adult of the second year in the bored channel of trunk or branches. It mainly damages more than 8 cm trunks in diameter. When the pest injures at the base of the trunk within 30 cm above the ground or at the branches of the tree, the trunk or branches are prone to break with strong wind. The pest can be controlled by injection of insecticides in the last ten days of September or by root application of insecticides in the first ten days of April, and above 90 percent of control effectiveness can be obtained.