Patterns of Damage by Phytophagous Insects on Leaves of Quercus Liaotungensi Interactions among host plants, phytophagous insects and natural enemies and relevant research methods Feeding preference of Gynaephora menyuanensis and its relationships with plant carbon and nitrogen contents in an alpine meadow on the Tibetan plateau Host-plant selection mechanisms and behavioural manipulation strategies of phytophagous insects Ecologically regulating functions of herbivore-induced plant volatiles Ecological function and prospects for utilization of cucurbitacins