山楂长小蠹发生规律和综合防治研究

ON THE BIONOMICS AND CONTROL OF HAWTHORN TRUNK BORER

山楂长小蠹Platypus sp.是造成山西晋城山楂树死亡的一种重要蛀干害虫。此虫1年发生2代,主要以成虫和幼虫在树体内越冬。成虫出树活动在1年中有3个高峰,即4月底至5月初、7月中旬至8月上旬和9月下旬至10月初。成虫飞翔力强,无趋光性。此虫的发生为害与山植树的年龄、树势、品种、立地条件及人工管理有密切的关系。加强林园综合管理,增强树势,并在成虫出树高峰期用速灭杀丁、氧化乐果200倍液喷射树体(每株用量5—8公斤)可取得良好防治效果。

In 1977—1985,more than 1500 hawthorn trees in the suburb of Jin- cheng City,Shanxi Province were killed by hawthorn trunk borer Pla- typus sp.,a serious hawthorn insect pest found a few years ago in this area.It was found that there are 2 generations a year of this insect, all stages,with adult and larva mainly,survive the winter within the tunnels.The adults move about outside the tunnels in following three peak periods:late April to early May,middle July to early August, and late September to early October.Its flight capability is rather strong,while without phototaxis. There are close relationships between the occurrence and damage of this insect and the age,vigour,variety,enviromental conditions and management situation.Thus,cultural control should be given first consideration to create conditions unfavorable to the pest.For killing the adults,such contact insecticides as deltamethrin(1:200)or om- ethoate(1:200),proved quite effective when used at a rate of 5 to 8 Kg per trunk and at the peak flight (?)seaon.