The Occurrence Regularity and Low Pollution Control of Two Species of Bamboo Aphids in Zizhuyuan,Beijing

In Zizhuyuan Park,Beijing,covering an area of 45.73hm²,a variety of bamboos have been introduced since 1971. There are 44 species of ornamental bamboo belonging to 12 genera,which are the main landscape plants in the park. In recent years,the occurrence and spread of bamboo aphids not only affect the growth and development of bamboo,but also lead to the leaves lose green and turn yellow,appear rusty spots and fall off,and even cause individual plant death in serious cases,which makes a large area of bamboo forest degrade and affect the landscape effect. Therefore,fixed-site,regular investigation and analysis, were conducted to explore the damage situation and occurrence regularity of two bamboo aphids in Zizhuyuan,Beijing. It was found that the Takecallis taiwanus was harmful to many bamboo species,causing serious damage to the growth and development of Phyllostachys mainly in the park. The pests mainly concentrated on the back of bamboo leaves at the petioles or leaf tips,as well as the shoot tips and tender shoot parts. The damage occurred in 12 months round a year,and May and October were the two peak months. Meanwhile,the Takecallis arundinariae mainly caused serious damage to the growth and development of Phyllostachys bambusoides in the park. Its population mainly concentrated in the middle part of the back of bamboo leaves. July is the peak of the aphid's damage. It had poor activity in winter and overwintered with eggs. The results showed that eco-environmental factors affected the life cycle and quantity of the two aphids. The forecast of the two pests should pay attention to the temperature in Beijing and the microclimate in the park,and scientific management should be carried out in the bamboo growth cycle,including maintaining the appropriate planting density of bamboo forest,rational application of biological agents,protection and utilization of its natural enemies. The aim of this study is to take effective control measures of low pollution before the peak period of aphid occurrence.