Abstract: The effects of Artemisia vulgaris and A. verbenacea on aphid repellency and resistance, and the components of volatiles were analyzed to discover the aphidresistant plants. We used Y-tube olfactometer behavioral trend test and indoor aphid infestation to identify the resistance of A. vulgaris and A. verbenaceato aphid. The volatile organic components were extracted via organic extraction and identified by GC-MS. Results from the Y-tube olfactometer behavior analysis showed that A. vulgaris and A. verbenacea are repellent to aphids.A. vulgaris and A. verbenaceahave an obvious inhibitory effect on the aphid population. The volatile components in the leaves, stems and roots of A. vulgaris andA. verbenacea were significantly different. The number of unique components in the leaves was significantly higher than that in the stems and roots. Furthermore, the concentrations of major common components in the leaves were higher. Eucalyptol, phytol, β-copaene and coumarin in the leaves and stems are toxic to insects. The neryl propionate is the major VOC in the roots. A. vulgaris and A. verbenacea have obvious effects on aphid repellency and resistance, and their leaves and stems contain many insect-resistant volatile components. Both species are aphid-resistant germplasms.

Key words: Choerospondias axillaris deciduous broadleaved forest, soil phosphorus, spatial heterogeneity, geo-satistics, GIS technique.