Biological Characteristics of Dominant Parasitic Natural Enemies of Kytorhinus immixtus on Caragana spp.

doi:10.16409/j.cnki.2095-039x.2025.09.020

Abstract

Abstract: Caragana spp., possess strong stress resistance and play a vital role in controlling desertification and stabilizing ecological balance, they are important resource plants for vegetation restoration and ecological reconstruction in desert and semi-desert areas in Northwest China. Kytorhinus immixtus is one of the main pests that damage Caragana seeds, for which parasitic natural enemies can afford effectively regulation. In this study, we investigated the diversity of parasitic natural enemies of K. immixtus by combining field survey and laboratory artificial rearing, and investigated the biological characteristics of the dominant natural enemy species, aiming to provide a theoretical basis for the biological control of this pest. The results showed that there were a total of 7 species, belonging to 6 genera and 3 families, of parasitical natural enemies of K. immixtus, including Bracon nigrorufum, Phanerotomella sp., Entedon sp., Aprostocetus sp., Pteromalus orgyiae, Pteromalus sp., and Mesopolobus sp. Entedon sp. and Aprostocetus sp. were the dominant species, both of which were koinobiont endoparasitoid and gregarious parasitoid. The maximum number of adult wasps emerging from a single host was 13 and 10, respectively, and the average sex ratios (female:male) of the two species were 1.62:1 and 1.60:1, respectively. There was a positive correlation between the number of emerging wasps, body size and sex ratio of the two dominant wasps and the body size of their hosts. Appropriately supplementing with a 20% sucrose solution could maximize the lifespan of the adults of the dominant parasitoids.

Key words: Kytorhinus immixtus, parasitic natural enemies, biological characteristics, dominant parasitoids

CLC Number:

S476.3

DING Rongrong, ZHANG Dazhi, HE Zeshuai, CHEN Liangyue, ZHAO Fuqiang, YU Xiaoqian. Biological Characteristics of Dominant Parasitic Natural Enemies of Kytorhinus immixtus on Caragana spp.[J]. Chinese Journal of Biological Control, 2026, 42(1): 114-126.

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