松褐天牛肿腿蜂对小灰长角天牛幼虫和蛹的寄生研究

A study on parasitism of Sclerodermus alternatusi(Hymenoptera:Bethylidae)on Acanthocinus griseus(Coleoptera:Cerambycidae)larvae and pupa

【目的】为明确小灰长角天牛幼虫和蛹能否有效繁育松褐天牛肿腿蜂,使其成为高效的替代寄主。【方法】将松褐天牛肿腿蜂按照蜂虫1:1的比例接种到小灰长角天牛幼虫和蛹上,观察其能否产生子代,并记录子代发育情况统计及数量。【结果】用小灰长角天牛幼虫和蛹繁育松褐天牛肿腿蜂时,寄生率分别为75%和85%,其中66.67%和70.59%的个体可繁育出肿腿蜂子代,两者无显著差异。松褐天牛肿腿蜂雌蜂产卵前期分别为8.53 d和7.94 d,子代卵历期分别为6.07 d和6.19 d,子代蛹历期分别为17.80 d和17.50 d,均无显著差异;子代幼虫历期分别为6.31 d和5.43 d,子代幼期历期分别为30.30 d和29.00 d,差异显著。用小灰长角天牛幼虫繁育时,子代雌蜂数量和子代总数分别为28.30头/管和29.70头/管,平均用蛹繁蜂时分别为25.50头/管和27.00头/管,比幼虫繁育时数量略低;平均子代雄蜂数分别为1.40头/管和1.50头/管;平均雄性比例分别为5.28%和5.71%,均无显著差异。【结论】小灰长角天牛幼虫和蛹均可有效繁育松褐天牛肿腿蜂。

[Objective]This study aimed to evaluate the variations in parasitism and progeny development of S.alternatusi on various stages of Acanthocinus griseus.[Method]In this experiment,the swollen leg beetle parasitoid was introduced to the larvae and pupae of the small gray longhorn beetle at a ratio of 1:1,and its ability to produce offspring was observed,along with the recording of the development of the offspring and the statistical analysis of its numbers.[Result]The findings demonstrated that there were no discernible differences in the parasitism rate and the emerging rate,and the parasitism rate were 75%and 85%,and the emerging rate were 66.67%and 70.59%.There were no discernible differences in the late-stage larva and pupa of A.griseus in the pre-oviposition period of the female wasp,the egg stage and the pupal stage of the wasps’progeny;their average pre-oviposition periods were 8.53 and 7.94 days,respectively,and the egg stage were 6.07 and 6.19 days,and the pupal stage were 17.80 and 17.50 days.There were significant differences in the larval stage and immature stage,and the larval stage were 6.31 and 5.43 days,and the immature stage were 30.30 and 29.00 days.Both the female offspring number and total offspring number of wasp parasitized the longhorn-beetle late-stage larva were slightly higher than parasitized the longhorn-beetle pupa.28.30 female offsprings and 29.70 offsprings were obtained when the parasitoid developed on the late-stage larva of A.griseus;while 25.50 female offsprings and 27.00 offsprings were obtained as the parasitoid developed on the pupa of A.griseus.However,the male offspring and male proportion showed no significant differences as the wasp used these two types of hosts,1.40 and1.50 male offsprings were obtained as the parasitoid developed on the late-stage larva and pupa of A.griseus,and the male rate were 5.28%and 5.71%.[Conclusion]This study showed that both the late-stage larva and pupa of A.griseus could be rearing S.alternatusi as a substitute host.