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

doi:10.16409/j.cnki.2095-039x.2020.06.010

Abstract

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 2^nd—5^th instars of L. sticticalis, but showed a significantly higher parasitism rate (68.89%) on the 5^th instar than on the other instars, and the highest emergence rate (73.88%) from the 5^th 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 4^th 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 4^th molt as the host in propagation of the parasitoid.

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

CLC Number:

WANG Danyang, WANG Yutong, SUN Bing, YU Liangbin, XU Linbo, KANG Aiguo, PANG Hongyan, CUI Yanwei. Effects of Larval Developmental Stage in Loxostege sticticalis on the Parasitismby Exorista civilis[J]. Chinese Journal of Biological Control, 2020, 36(6): 880-884.

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