Abstract: In order to assess the oviposition preference of Holcocerus hippophaecolus to tree species, we selected 21 tree species from Inner Mongolia, Sichuan and Ningxia, of which 15 were sea buckthorn (Hippophae rhamnoides). All tree species were planted in Pengyang County of Ningxia and were infected by artificial infection in a cage or natural infection in the wild. The results showed that adult Holcocerus hippophaecolus had a significant oviposition preference to tree species. Taking the susceptible and indigenous species, Chinese sea buckthorn (Hippophae rhamnoides subsp. sinensis) as control, the tree species were divided into four groups, i.e. 1) oviposition-refusing tree species: H. salicifolia, H. rhamnoides subsp. yunnanensis, Ulmus pumila, Prunus persica, Malus pumila and Prunus armeniaca; 2) low oviposition tree species: Xiuyisike×Zhongguoshaji, Wulangemu × Zhongguoshaji, Xiaguang, Lengguo, Leiguo, Taiyang, Elaeagnus angustifolia and Pyrus sp.; 3) high oviposition tree species: Hunjin, Wulangemu, Yousheng and  Chuyi; 4) oviposition-preferred tree species: Chengse and  Ayaganka. Additionally, Holcocerus hippophaecolus showed oviposition preference to height and direction of the host trees on which it would oviposite. Height was positively correlated with the diameter of the tree trunk and oviposition occurred mostly on the south side of the trunk. 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