title: [Effects of plant hedgerow on population dynamics of wheat aphid and its natural enemies].
abstract: This paper studied the effects of planting different kinds of plant hedgerow (Amorpha fruticosa, Vetiveria zizanioides, Eulaliopsis binata, and Medicago sativa) on the population dynamics of wheat aphid and its natural enemies in the hillside wheat fields in Ziyang City of Sichuan Province, Southwest China. On the 20 degrees hillside, A. fruticosa hedgerow inhibited the occurrence of wheat aphid in the wheat field significantly, and the parasitoid densities were equal to or significantly lower than those in the wheat field with V. zizanioides hedgerow. On the 12 degrees hillside, M. sativa and E. binata hedgerows delayed the peak time of wheat aphid occurrence, and E. binata hedgerow suppressed the wheat aphid population density significantly. In the wheat field with M. sativa hedgerow, the parasitoid densities were significantly higher than those with no hedgerow. An equal or significantly higher ladybird density was observed in the field with M. sativa hedgerow. The olfactory responses showed that E. binata volatiles had repellent effect on both Sitobion avenae and Rhopalosiphum padi, but attracted a spider species of oxyopidae. M. sativa volatiles attracted S. avenae, whereas neither M. sativa nor E. binata volatiles caused obvious behavior response of ladybird adults. Therefore, planting A. fruticosa and E. binata as the hedgerows in hillside wheat fields could not only prevent the soil erosion from seasonal rainfall, but also benefit the control of pest insects.
authors.affiliation: College of Agronomy & Biotechnology, China Agricultural University, Beijing 100193, China. shiguoqing19821100@126.com
authors.forename: Guo-Qing
authors.initials: GQ
authors.lastname: Shi
authors.forename: Chao-Wen
authors.initials: CW
authors.lastname: Lin
authors.forename: Zhang-Yong
authors.initials: ZY
authors.lastname: Liu
authors.forename: Chuan-Ren
authors.initials: CR
authors.lastname: Li
authors.forename: Yi-Bing
authors.initials: YB
authors.lastname: Chen
authors.forename: Tao
authors.initials: T
authors.lastname: Ma
authors.forename: Qi-Feng
authors.initials: QF
authors.lastname: Wang
authors.forename: Zhi-Long
authors.initials: ZL
authors.lastname: Liu
authors.forename: Qing-Nian
authors.initials: QN
authors.lastname: Cai
mesh_terms: D000383:Agriculture / Q000379:methods; D000818:Animals; D001042:Aphids / Q000254:growth & development*; D002681:China; D007887:Fabaceae / Q000254:growth & development* / Q000502:physiology*; D010572:Pest Control, Biological / Q000379:methods*; D011157:Population Dynamics; D014908:Triticum / Q000254:growth & development / Q000469:parasitology*