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一、前言 梣叶枫(Acer negundo Linnaeus)在济南多作为庭园树,行道树及平原地区造林之用,以其生长较快,木材可作一般器具及建筑材料,因而栽植较广。但自幼苗迄成长之后皆有扁平球坚介壳虫寄生,据观察所及几乎每树皆被其寄生。如本院农场苗圃梣叶枫苗,每株干上都虫体密集,在成年大树之枝条上亦虫体累累引人注意(图19.20)。此虫在为害期间经常自肛门中排洩出无色液体小滴,落于叶面上非但阻碍叶之生理作用,并且招致蝇类吸食和煤菌寄生,既有碍观瞻,亦极不卫生。只以有关此虫之研究报导国内尚未见及,为对此虫
I. INTRODUCTION Acer negundo Linnaeus is widely used as a garden tree, road tree and plains area in Jinan. Due to its rapid growth, wood can be used as general equipment and building materials and thus is widely planted. However, since the seedlings grow up after the flat ball Jian insects parasitic, it is observed and almost every tree is its parasitic. For example, in our nursery, leaf-maple seedlings are densely larvae on each plant stem, causing parasites to attract attention on the branches of adult trees (Figure 19.20). This pest often excretion of colorless liquid droplets from the anus during the damage, not only hinder the physiological role of the leaves, but also lead to parasitic flies and coal bacteria, both obstruct the view, but also very unhygienic. Only for the study of this worm has not been seen in the country, for this worm