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近两年来,我们在不同世代的稻纵卷叶螟发生期间采集各龄幼虫共1400头,并经饲养观察,取得各龄幼虫寄生性天敌共10种。现将它们的寄生率表列如下。
In the past two years, we collected 1400 larvae of all ages from different generations of C. medinalis and observed 10 species of larvae of parasitized natural enemies. Their parasitic rates are tabulated below.