斜紋夜盜蟲(Spodoptera litura Fab.)之寄生蜂

Abstract

本文報導木省產斜紋夜盜蟲(Spodoptera litura Fab., Noctuidae, Lepidoptera)之天敵。計有膜翅目天敵4科、8屬、10種。分別為Snellenius manilae, Microplitis pallidipes, M. tuberculifer, Apanteles ruficrus, A. plutellae, Meteorus sp.(Braconidae); Campoletis chlorideae, Charops bicolor (Inheeumonidae) Euplectrus sp. (Eulophidae）及Triohogramma dondrolimi (Tricho-grammatidae）。其中除T. dondrolimi為卵期寄生蜂外，其餘概為幼蟲期寄生。又其中7種如M. pallidipes, M. tuberculifer, A. plutellae, Meteorus sp. C. bicolor Euplectrus sp.及T. dondrolimi係本蟲寄生新紀錄；而M. pallidipes, M. tuberculifer, Meteorus與Euplectrus 各1種則為本省分布新紀錄。 寄生性天敵中以馬尼拉小繭蜂(S. manilae)在本省之分布最為普遍，其寄生率可高達43.9%，且在本文報導之各種寄生蜂中其出現率佔91.33%，就利用其抑制斜紋夜盜蟲發生密度而言，頗值注意。又此蜂之重複寄生蜂及其他寄生蜂之形態、特徵，部分生態資料以及分類檢索表等文中均有記述。 The survey on the parasitoids of armyworm, Spodoptera litura was carried out from May, 1974 through April of 1975. The collecting area were covered Taipei, Hsinchu, Tai-chung, Chiayi and Kaohsiung. The parasitoids of S. litura reported in this paper included one species of egg parasitoid, Trichogramma dendrolirni and 9 species of larval parasitoids e. g. Snellenius manilae, Microplitis pallidipes, M. tuberculifer, Apanteles ruficrus, A. plutellae, Meteorus sp., Charops bicolor, Campoletis chlorideae and Euplectrus sp. Among them, 7 species are new records of parasitoids of S. litura and 4 species are new to Taiwan. Snellenius maniiae is the most common parasitoid to be found on S. litura on this island. The percentage of parasitism of the parasitoid ranged from 5.3% to 43.9% through year. It usually occurred abundantly in October and November. Five species of hyperparasites of S. manilae have been identified as Eupteromalus parnarae Gahan (Pteromalidae), Stictopisthus sp. A. Stictopisthus sp. B, Diatora prodeniae Ash. (Ichneumonidae), and one unidentified species of Ceraphronidae. All the species are new record to Taiwan.