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Chinese Journal of Biological Control ›› 2020, Vol. 36 ›› Issue (6): 880-884.DOI: 10.16409/j.cnki.2095-039x.2020.06.010

• RESEARCH REPORTS • Previous Articles    

Effects of Larval Developmental Stage in Loxostege sticticalis on the Parasitismby Exorista civilis

WANG Danyang1,2, WANG Yutong1,3, SUN Bing4, YU Liangbin1, XU Linbo1, KANG Aiguo5, PANG Hongyan5, CUI Yanwei1   

  1. 1. Institute of Grassland Research of Chinese Academy of Agricultural Sciences, Huhhot 010010, China;
    2. Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, China;
    3. Inner Mongolia Agricultural University, Huhhot 010018, China;
    4. Huhhot Ecological Environment Monitoring Station of Inner Mongolia Autonomous Region, Huhhot 137400, China;
    5. Plant Protection Station, Kangbao County, Zhangjiakou 076650, China
  • Received:2020-12-17 Published:2021-01-09

Abstract: Exorista civilis is an important natural enemy and plays an important role in the biological control of Loxostege sticticalis, Mythimna seperata and other pests. Larvae of L. sticticalis were parasitized at different stadium by E. civilis to evaluate the parasitism rates for the purpose of improving indoor propagation and field application of the parasitoid flies. Under (25±1) ℃, relative humidity (65±5)% and photoperiod 14L:10D, E. civilis parasitized the 2nd—5th instars of L. sticticalis, but showed a significantly higher parasitism rate (68.89%) on the 5th instar than on the other instars, and the highest emergence rate (73.88%) from the 5th instar host. With the age increase of the host, the parasitism ability of E. civilis increased first and then decreased, the highest parasitism rate (74.44%) and emergence rate (78.76%) was observed from the host larvae at 2—3 days after the 4th molt. From these host larvae, offspring wasps developed the fastest and realized the highest oviposition. Therefore, it is preferable to select the host larvae at 2—3 days after the 4th molt as the host in propagation of the parasitoid.

Key words: Exorista civilis, Loxostege sticticalis, host instar, parasitic efficiency

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