福建沙县稻弄蝶寄生性天敌调查初报

8～11月在福建省沙县稻田调查,发现稻弄蝶卵寄生蜂4种,其中以拟澳洲赤眼蜂、稻螟赤眼蜂和稻苞虫黑卵蜂为主。同期在稻田内挂卵调查,寄生率为5.3～14.7％,平均10.4％,10～11月初田边杂草上卵寄生率为10～39.3％,平均28.6％。11月中下旬采的卵中发现有越冬的寄生蜂,翌年3月陆续羽化。弄蝶幼虫期有7种原寄生天敌和3种重寄生天敌;前者以稻苞虫凹眼姬蜂、银颜筒寄蝇和弄蝶绒茧蜂为主,寄主多在3～5龄时被杀死。8～9月田间幼虫寄生率为30.3～75.7％,平均为48.2％,对稻弄蝶虫口有一定的控制作用。

A FIELD SURVEY ON THE PARASITOIDS OF RICE HESPERIIDS IN SHAXIAN COUNTY, FUJIAN PROVINCE

Four species of egg parasitoids of the rice hesperiids were recorded in the field surveys conducted in Shaxian County, Fujian Province during August-November, 1982. Trichogramma confusum, T.japonicum and Telenomus sp. were the predominant species. Exposing the eggs of the skippers in the field during the same period resulted in an average parasitization rate of 10.4% (ranging 5.3-14.75), During October to November, the parasitization rate of the skippers on the weeds at edges of the rice fields was 26.6% (ranging 10-39.3%).