我市行道树以悬铃木为主,从1978年开始,相继发生日本蜡蚧(龟蜡蚧)。据观察,平均30厘米长的枝条有越冬固定蜡蚧70—80个,最多达200余个,影响树木发芽、放叶,感染煤病,致小枝枯死,严重威胁树木生长。 开始,我们曾采用多种农药进行防治,由于对此虫的生活习性不了解,效果不显著。近两年我们对此虫进行了生物学特性的观察,并开展测报,在掌握其生活规律的基础上积极进行防治,取得较好效果,现将观察及防治情况介绍于下: (一) 日本蜡蚧在我市一年发生一代,主要危害悬铃木,也加害无患子、重阳木、榆等树种。它以雌成虫固定在1年生小枝上越冬,严重时2年生枝条也有。越冬母体蜡质分泌物很厚,初呈白色,逐渐变成灰白色,略呈半球状,老熟时呈灰黄色,表面有龟,甲状凹线,蜡壳中央有角状突起,周围有8个粗糙突起,上面有菌类寄生,变成黑色,老熟蜡 My city sidewalk trees dominated by Platanus, from 1978 onwards, have occurred in Japan wax scale (turtle wax scale). It is observed that an average of 30 cm long branches with overwintering wax scale 70-80, up to more than 200, affecting the trees sprout, leaf release, infection of coal disease, causing branchlets dead, a serious threat to the growth of trees. Initially, we have used a variety of pesticides for prevention and control, due to the habits of insects do not understand, the effect is not significant. In the past two years, we have observed the biological characteristics of this pest and carried out the measurement report. We have actively carried out prevention and treatment based on the laws of their life and achieved good results. Now, the observations and preventions are introduced below: (1) Japan Wax scale occurred in our city a year, the main hazards Platanus, also harmless child, Chongyang wood, elm and other tree species. It is female adults fixed in the 1 year branchlets wintering, severe 2-year-old branches also have. Overwintering maternal waxy secretions thick, initially white, gradually turned gray, slightly hemispherical, grayish yellow when mature, the surface turtle, thyroid groove, wax shell central horn-like projections, surrounded by 8 Rough protrusions, fungi parasitic above, into a black, cooked wax