越北腹露蝗卵寄生蜂：东方蝗卵蜂

Parasitism of Fruhstorferiola tonkinensis Will. eggs by Scelio orientalis Dodd(Hymenoptera:Scelionidae)

东方蝗卵蜂Scelio orientalis Dodd是越北腹露蝗Fruhstorferiola tonkinensis Will.卵的寄生性天敌。2004～2006年对广东省北部越北腹露蝗卵粒和卵块寄生率分别为43.18%和89.34%。东方蝗卵蜂产卵在越北腹露蝗卵中,幼虫期为2龄,每粒被寄生的蝗卵只出1头蜂。东方蝗卵蜂的产卵系统发达,不仅骨化程度高,而且具有伸缩性。雌雄性比约为1:0.6,羽化后即可交配。以5%的葡萄糖溶液喂养成蜂,最多可存活31d。东方蝗卵蜂可能是某些年份越北腹露蝗种群下降的重要因子。

Surveys of Scelio orientalis Dodd, a hymenopterous parasitoid of eggs of the grasshopper Fruhstorferiola tonkinensis Will. , were conducted in Northern Guangdong, China during 2004 - 2006. Parasitism of F. tonkinensis eggs and egg-pods was 89.34%, 43.18%, respectively. Female S. orientalis laid into F. tonkinensis eggs and their progeny developed as internal parasitoids. There were 2 larval instars and pupation took place within F. tonkinensis eggs. Only single adult S. orientalis emerged per host egg. Mating took place before oviposition as soon as adults emerged. The ovipositor system was telescopic and highly sclerotized. Sex ratio （ female ： male） was about 1：0. 6. Longevity of S. orientalis lasted 31 days with feeding 5% sugar solution. The scelionid wasp S. orientalis may be an important factor in keeping down F. tonkinensis population in some years.