Journal of Integrative Agriculture ›› 2020, Vol. 19 ›› Issue (2): 394-405.DOI: 10.1016/S2095-3119(19)62699-7

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  • 收稿日期:2018-11-06 出版日期:2020-02-01 发布日期:2020-01-18

Potato/Maize intercropping reduces infestation of potato tuber moth, Phthorimaea operculella (Zeller) by the enhancement of natural enemies

ZHENG Ya-qiang1, ZHANG Li-min1, CHEN Bin1, YAN Nai-sheng1, GUI Fu-rong1, ZAN Qing-an1, DU Guang-zu1, HE Shu-qi1, LI Zheng-yue1, GAO Yu-lin3, XIAO Guan-li2  
  

  1. 1 State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, P.R.China
    2 College of Agriculture & Biology Technology, Yunnan Agricultural University, Kunming 650201, P.R.China
    3 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
  • Received:2018-11-06 Online:2020-02-01 Published:2020-01-18
  • Contact: Correspondence XIAO Guan-li, Mobile: +86-13888217416, E-mail: glxiao9@163.com; CHEN Bin, Mobile: +86-13708876067, E-mail: chbins@163.com
  • About author:ZHENG Ya-qiang, Mobile: +86-15288338237, E-mail: 15288338237@163.com;
  • Supported by:
    This research was supported by the National Key Research and Development Program of China (2018YFD0200703 and 2018YFD0200802) and the National Natural Science Foundation of China (3176059 and 31660537).

Abstract:

The potato tuber moth (PTM), Phthorimaea operculella (Zeller), is one of the most economically significant insect pests for potato in both field and storage worldwide.  To evaluate the infestation, reduction of potato yield and the control efficacy for PTM, field tests were conducted in two seasons by intercropping of potato as the host plant with maize as a non-host plant of PTM.  Three intercropping patterns were tested, which were 2 rows of potatoes with either 2, 3, or 4 rows of maize (abbreviated 2P:2M, 2P:3M, and 2P:4M), and the monocropped potato as the control, 2 rows of potatoes, without maize,  (abbreviated 2P:0M).  Results showed that the population and infestation of PTM in the 2P:3M intercropping pattern was significantly lower than those in 2P:2M, 2P:4M and the monocropping pattern of 2P:0M, due to the enhancement of natural enemies.  Cumulative mines and tunneling in potato leaves in 2P:3M intercropping were significantly lower than those in 2P:2M and 2P:4M patterns.  The population of parasitoids and the parasitism rate of PTM in intercropping pattern of 2P:3M were significantly higher than that in intercropping pattern of 2P:2M, 2P:4M and monocropping pattern of 2P:0M.  We conclude that the potato intercropped with maize reduced the adult and larva populations, and reduced the damage from PTM by enhancing the number of parasitoids and the level of parasitism.  The greatest population density of parasitoids and parasitism rate were in the intercropping pattern of 2 rows of potatoes with 3 rows of maize.  These data indicate that the host/non-host intercropping patterns can be used as a biological control tactic against PTM by enhancing the density of natural enemies in the agro-ecosystems.
 

Key words: potato tuber moth ,  Phthorimaea operculella (Zeller) ,  intercrop ,  biological control ,  natural enemies ,  parasitoids