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柳牡蛎蚧(Lepidosaphes Salicina Borch.)是杨树的主要害虫之一。幼树着生该虫,很快形成小老树,不能成材,甚至很快枯死。7年生以上的树着生该虫20％,胸径减少4.06％,着虫80％,胸径减少35.8％;10年生树着生该虫20％,胸径减少5.92％;着虫80％,胸径减少36.2。据1989年调查,长治市13个县区有610万多株杨树受到危害,被害株率达75％左右。造成了巨大的经济损失。采用环刮涂药法防治柳牡蛎蚧,具有简便、经济和效果好等优点。具体做法是:从该虫卵孵化盛期开始(长治市一般年份在5月15日至6月5日),将树皮环刮,去掉腊质层或老皮,以不伤韧皮部和形成层为准。环刮宽度为3～7cm,位置以操作方便和避开死节为好,将配制好的药液用刷子涂于环上,通过内吸输导作用,使其中毒致死。杀虫率久效磷为69％,氧化乐果68.7％。识别该虫死活的办法有两种:一是目测死虫与活虫的百分率。标准是①群体里大小虫体有明显区别所
Lepidosaphes Salicina Borch. Is one of the major pests of poplar. Sapling with the worm, quickly formed a small old tree, can not become a success, and even died soon. 7-year-old tree born with the 20% of the worm, DBH decreased 4.06%, 80% of the worm, DBH decreased 35.8%; 10-year-old trees with 20% of the worm, DBH decreased 5.92%; . According to the 1989 survey, more than 6.1 million poplar trees were damaged in 13 districts and counties in Changzhi City, killing about 75% of the strains. Caused a huge economic loss. It is simple, economical and effective to control the oyster oyster by using the ring scraping method. The specific approach is: from the peak incubation period of the worm (Changzhi City, the general year in the May 15 to June 5), the ring bark scraping, remove the waxy layer or the old skin, so as not to damage the phloem and the formation of layers Prevail. Ring scraping width of 3 ~ 7cm, the location to facilitate the operation and avoid the dead section as well, the preparation of a good solution with a brush applied to the ring, through the absorption guide role, making it poisoning. Insecticidal rate of monocrotophos 69%, omethoate 68.7%. There are two ways to identify the insects: one is the visual observation of the percentage of dead insects and living insects. The standard is ① group size insects have obvious difference