Journal of Integrative Agriculture ›› 2019, Vol. 18 ›› Issue (4): 873-883.DOI: 10.1016/S2095-3119(18)61927-6

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  • 收稿日期:2017-10-13 出版日期:2019-04-01 发布日期:2019-04-01

Volatiles from Sophora japonica flowers attract Harmonia axyridis adults (Coleoptera: Coccinellidae)

XIU Chun-li1*, XU Bin1, 2, 3*, PAN Hong-sheng4, ZHANG Wei1, 2, YANG Yi-zhong2, LU Yan-hui1 
  

  1. 1 State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China
    2 College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225007, P.R.China
    3 Lixiahe Regional Institute of Agricultural Sciences of Jiangsu, Yangzhou 225007, P.R.China
    4 Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, P.R.China
  • Received:2017-10-13 Online:2019-04-01 Published:2019-04-01
  • Contact: Correspondence YANG Yi-zhong, E-mail: yzyang@yzu.edu.cn; LU Yan-hui, E-mail: yhlu@ippcaas.cn
  • About author: * These authors contributed equally to this study.
  • Supported by:
    This study was financially supported by the National Key Research and Development Program of China (2017YFD0201900), the National Natural Science Foundation of China (31621064), and the earmarked fund for China Agriculture Research System (CARS-15-19).

Abstract:

The multicolored Asian lady beetle, Harmonia axyridis (Coleoptera: Coccinellidae), is a common generalist predator in China and is occasionally found gathering on the Chinese pagoda tree, Sophora japonica, in summer.  In a field investigation, we found that H. axyridis adults preferred S. japonica during its flowering period even though their optimal prey (aphid) is absent at this time.  In addition, male and female adults were attracted to S. japonica flowers to a similar extent in a Y-tube olfactometer assay.  Using coupled gas chromatography-electroantennogram detection (GC-EAD), we identified a flower odor component (nonanal) that elicited a significant electrophysiological response in H. axyridis.  Electroantennogram (EAG) dose-dependent responses revealed that the amplitude of the adult beetle’s EAG response increased with increasing concentration of nonanal, peaking at 10 mg mL–1.  In Y-tube olfactometer behavioral tests, H. axyridis adults preferred a 10 mg mL–1 nonanal source over a 100 mg mL–1 diluent.  Under field conditions, the adults were significantly attracted to both concentrations (10 and 100 mg mL–1), and high concentrations generally had greater attraction.  All these results suggest that nonanal, a volatile compound of S. japonica flowers, greatly attracts H. axyridis adults.  This study provides a basis for the development of synthetic attractants of H. axyridis, with the potential to promote biocontrol services of this generalist predator in the native area (e.g., China) and to suppress its population by mass trapping in its invasive areas. 

Key words: flower preference ,  plant volatile ,  electrophysiological response ,  behavioral response ,  attractants