Pests investigation of ancient tree and its control strategiesA case study in Lanzhou Wuquan mountain park

The species and damage of insect pests on ancient and famous trees was investigated at Wu Quan mountain Park of Lanzhou, Gansu province, China, based on reconnaissance and insect pests specimen of identification method. The results indicated that pests species was plenty mainly composited of Orthoptera and Lepidoptera species which accounted for 80% of total pest species, such as Phenacoccus fraxinus, Aphis gossypii, Holeocerus insulanis and so on. In addition, hazard of Dipteras Rhabdophaga Saliciperda Duf and Acariformess Eotetranychus populi were also very serious.The occurrence of insect pest exhibited seasonal characteristics, species and stages of pests and larval density varied with months, and the highest larval density was observed in August. Comprehensive control methods that combined physical, chemical and biological method were proposed to control the pests, especially physical and biological control should be strengthened.