论文部分内容阅读
松干蚧是为害松树的一种介壳虫,虫体只有芝麻大小。它寄生于松树干、枝隙缝和小枝表面以及松叶基部吸取树液,致使枝条软化下垂,继而自下而上地枯死,皮层组织败死,形成烂斑。如杭州西湖山区松林受害面积已达一万多亩,有的松树已经枯死。松干蚧一年发生二至三代,以寄生蚧越冬,在卵囊期借风、水和人的活动扩散传播。杭州市园管局职工和科技人员对松干蚧进行了防治试验。在寄生蚧为害时期,他们刮去老
Songkrania scabies is a kind of scale insect pests, insects body size only sesame. It parasites in the pine trunk, branchlets and branchlets and branchlets, as well as the roots of pine needles, which cause the branches to soften and droop, then wither from bottom to top, and the cortical tissues are decayed to form rotten spots. For example, the damaged area of pine forests in West Lake Mountain of Hangzhou has reached over 10,000 mu, and some of the pine trees have already died. Song dry scale occurrence of two to three generations a year to parasitic overwintering in the oocyst, by the wind, water and human activity spread spread. Hangzhou City Park staff and scientific and technological personnel of the Song Kuai conducted prevention and control tests. During the period of infestation, they scrape off the old