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一、双条杉天牛的生物学特性及发生规律 双条杉天牛是国内森林植物检疫对象之一,主要危害侧柏、桧柏,是一种毁灭性蛀干害虫,常导致整株枯死。随着北京地区绿化事业的发展,“四季常绿、三季有花”原则的制定,桧柏、侧柏成为北京地区造林绿化的主要品种。但双条杉天牛的危害却对造林成果产生巨大的影响。1989年京密引水林带标准段更新改造,桧柏有近三分之一由于双条杉天牛危害而致死。京密引水渠是北京的输水大动脉,化学农药防治必将对水源产生不利影响,同时也会杀死天敌昆虫,影响生态平衡。如何解决这个问题,就要对双条杉天牛生活习性进行观察、了解、寻找以虫治虫的生物防治方法或者物理方法进行防治就可以取得显著的效果。
First, the biological characteristics and occurrence of Cunninghamia lanceolata Caterpillar Canescens is one of the domestic forest plant quarantine objects, the main harm Platycladus orientalis, cypress, is a destructive insects, often lead to the whole plant dead . With the development of greening in Beijing, the principle of “Four Seasons Evergreen and Three Seasons Flowers” has been established. Cypress and Oriental Arborvitae have become the main varieties of afforestation in Beijing. However, the damage caused by the double-cedar taxon has a huge impact on the afforestation outcome. In 1989, the standard section of Jingmi diversion forest was updated and renovated. Nearly one third of the juniper trees were killed due to the damage of the double-cedar Tian cattle. Jingmi Drainage Channel is a water-transmissive artery in Beijing. Chemical pesticide control will inevitably have an adverse impact on water sources and will also kill natural enemy insects and affect ecological balance. How to solve this problem, it is necessary to observe the life habits of Cunninghamia lanceolata, understand, look for pest control biological methods of biological control or physical methods can achieve significant results.