Parasitism Ability and Offspring Development of Sclerodermus alternatusi Yang (Hymenoptera: Bethylidae) in Different Female Oviposition Times

doi:10.16409/j.cnki.2095-039x.2022.11.004

Abstract

Abstract: Sclerodermus alternatusi is a synovigenic parasitoid in which oogenesis takes place after the female is stimulated by feeding on a host, and this is a successive process. Generally, one female parasitoid can complete several times of parasitism and thus parasitize more than one hosts in its life span. In order to compare the differences of adult parasitism ability and offspring development of S. alternatusi in different adult oviposition times, the female parasitism rate, successful parasitism rate, progeny developmental duration, brood size, and male proportion were investigated in the laboratory conditions. The results showed that S. alternatusi female could complete four times of parasitization to the host, Thyestilla gebleri larvae. There were 85% of female parasitoids could complete two times of parasitization, but only 31% and 4% of females could complete three or four times of parasitization. The parasitic ability of the female parasitoid gradually decreases with the increase of the oviposition times. The durations of egg stage showed no significant difference in different oviposition times. However, the larval stage and pupal stage of the offspring were significantly different in different oviposition times, which displaying the longest in first oviposition time and the shortest in fourth oviposition time. The numbers of female and male offspring were significantly different among different oviposition times. The female offspring numbers were 40.2 and 35.1 in the first and second oviposition time, respectively. The numbers of male offspring were also less than 10 in these two oviposition times. The numbers of female offspring were sharply declined in the third oviposition time, over 60% of offsprings were males. Moreover, all of the offspring were males in the fourth oviposition time. The mean number of female offspring of a single S. alternatusi adult was approximately 80. This study provides new references for rearing and using the S. alternatusi to control the longhorn beetles.

Key words: Sclerodermus alternatusi, parasitism ability, developmental duration, brood size

CLC Number:

S476.3

TANG Yanlong, WANG Lina, CHEN Yan, KANG Kui, ZENG Boping, YANG Zhongqi, WEI Ke. Parasitism Ability and Offspring Development of Sclerodermus alternatusi Yang (Hymenoptera: Bethylidae) in Different Female Oviposition Times[J]. Chinese Journal of Biological Control, 2023, 39(3): 499-506.

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