| Aphids are very important pests in agriculture and forestry which can cause serious economic loss. Hosts attacked always show the symptoms of malnutrition and malformation. Among all aphids, tens of species represented by Aphis gossypii and Myzus persicae are the most dangerous, many of which could spread some kinds of virus diseases.Beijing is located in the zone of transition between Palaearctic realm and Oriental realm by zoogeographical region, and which is affluent in vegetation and complex in entironment. Therefore, aphid species are abundant and the composition of the fauna is very particular.Along with the quickening of city virescence, more and more aphids on ornamental plants appear every year.Up to now, no monograph about aphids on ornamental plants was found except the simple directory by Hongfu Zhu in 1949 and the tiny reports by Guangxue Zhang & Tiesen Zhong in1979.People are paying more and more attention to the residue of pesticide in recent years and many pesticides killing aphids were limited to register or use.Microscopical identification is used by comparing the morphologic difference between aphids from different regions of Beijing in this article. Altogether 148 species of 64 genera belong to 9 families on ornamental plants were recorded and narrated. Identification key for aphids and their hosts were made respectively. Furthermore, field identification key for the familiar aphids in trees was made according to hosts and systematic s, and this made it easy to identify aphids on the spot.Indoor pesticide experiments were done with Aphis gossypii and Myzus persicae, and the results showed that the control efficiency of abamectin, imidacloprid and acetamiprid are all higher than that of pyrethroid. It's appropriate to control pests on ornamental plants with these three pesticides because of the safety to natural enemies and the long residual life.
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