Potential non-target effects of Sclerodermus harmandi (Hymenoptera:Bethylidae) on Triaspis sp. (Hymenoptera:Braconidae)

Sclerodermus harmandi (Buysson) (Hymenoptera: Bethylidae) is a generalist parasitoid that has been mass-produced and released for biological control of many agricultural and forest pests in China. However, few studies have examined the potential non-target risks of this parasitoid in targeted agriculture or forest ecosystems. In this study, we demonstrate that S. harmandi successfully attacks Triaspis sp. (Hymenoptera: Braconidae), an important native natural enemy of the pine weevil pest Pissodes punctatus Langor et Zhang in Yunnan Province of China. When exposed to older larvae of Triaspis sp. at three different parasitoid-to-host group sizes (1:1, 2:2 and 3:3) with a constant 1:1 parasitoid-to-host ratio, S. harmandi successfully attacked 100%, 75% and 83.3% of the test larvae, respectively. All life stages (egg, larva, pupa and adult) of S. harmandi were observed on Triaspis sp. larvae, indicating that Triaspis sp. are suitable for the completion of S. harmandi development. There were no significant differences in the number of S. harmandi progeny produced among the different parasitoid-to-host exposure treatments. Immature stages of S. harmandi on parasitized Triaspis sp. took 25.4 days to complete their development (the egg stage: 3.6 days, the larval stage: 5.0 days, the pupal stage: 16.5 days). Together, results from our study indicate that mass-releases of S. harmandi for biological control of forest pests in Yunnan Province may adversely affect some valuable non-target insects such as Triaspis sp. We suggest that the potential non-target risk of S. harmandi be considered in future augmentative release biological control programmes against forest pests.     

New subgenus of the genus Schizoprymnus (Hymenoptera: Braconidae) from Japan, having a unique abdominal carapace structure

A new subgenus of the genus Schizoprymnus Foerster is described and figured from Honshu, Japan. The subgenus, Ibarakius subgen. nov., comprises three species, S. (I.) gotoi sp. nov. (type species), S. (I.) kaizawus sp. nov., and S. (I.) honshuensis sp. nov. A pair of long, curved posteroventral processes on the carapace is unique to Ibarakius subgen. nov. The variability of frontal protuberances and sutures of the carapace in the brachistine genera Triaspis Haliday and Schizoprymnus Foerster is discussed.     

中国寄生于木蠹象和小蠹虫的三盾茧蜂一新种(膜翅目:茧蜂科)

记述采自黑龙江小兴安岭寄生于木蠹象和小蠹虫的茧蜂科1新种——木蠹三盾茧蜂Triaspisnanchaensissp.nov.,模式标本的正模保存于中国林业科学研究院昆虫标本馆,副模保存于东北林业大学昆虫标本室。