Attractiveness of flowering shrubs in urban green space in Beijing to natural enemies of insect pests
Author of the article:WANG Jian-Hong** LI Guang QIU Lan-Fen CHE Shao-Chen SHAO Jin-Li ZHONG Li
Author's Workplace：(Beijing Institute of Landscape Architecture, Beijing 100102, China
Key Words：flowering shrubs, hoverflies, lacewings, ladybugs, parasitoids, biological control, yellow sticky board
[Objectives] To investigate the attractiveness of flowering shrubs in urban green spaces in Beijing to parasitic and predatory invertebrates that supplement their diet with nectar and/or pollen. Adults of many species of parasitic and predatory invertebrates supplement their diet behaviors by visiting flowering plants to feed on nectar and/or pollen. The availability of flowering plants could therefore increase the number of such parasites and predators, thereby improving the biological control of insect pests. [Methods] Yellow sticky boards were hung under flower shoots to trap parasitic and predatory invertebrates feeding on nectar or pollen. The statistical significance of differences between the number of parasites and predators trapped at flowering plants and at control plants was assessed with Student’s t-test. [Results] Hover flies visited Cornus officinalis, Tilia mongolica, Rosa multiflora inermis and Euonymus maackii, but preferred Jasminum nudiflorum. Lacewings visited C.officinalis, F. suspensa and E. maackii but preferred T. mongolica, S.kirilowii and M. liliflora. Ladybugs visited Rose hybrida cv. Floribunda and T. mongolica, but preferred E. maackii and C. officinalis. Parasitoids preferred C. officinalis, F. suspensa, E. maackii and S. trilobata. [Conclusion] C. officinalis and F. suspensa, which bloom in early spring, T. mongolica, which blooms in midsummer, and Rose hybrida cv. floribunda which flowers in three seasons, can significantly increase the abundance of some natural enemies of pest insects.