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稻螟赤眼蜂是三化螟卵的一种寄生蜂。根据前人研究,它对三化螟卵的寄生率,各世代间的变化缺乏规律,常呈波浪式的消长现象,在应用时就很难掌握。故此,未能引起人们的足够重视。我所1963年进行水稻螟虫预测预报时,对该蜂进行了观察。现将有关资料整理如下。 从左表可以看出,赤眼蜂的寄生率是逐代上升的,尤其是第三代到第四代,寄生效果的变化幅度颇大,卵块寄生率由71.7％上升到100％,卵粒寄生率由17.3％上升到64.5％,第四代三化螟卵平均每块孵出蚁螟数仅7.8条,由于寄生率高,对减轻当年晚稻螟害起了很大作用。
Trichogramma ostriniae is a parasitic wasp of the rice borer. According to previous studies, its parasitism on the rice stem borer, the lack of regular changes between generations, often showed a wave-like growth and decline, it is difficult to grasp in the application. Therefore, it failed to attract enough attention. The bee was observed in our forecast of rice stem borers in 1963. The relevant information is now organized as follows. As can be seen from the table on the left, Trichogramma parasitism increased from generation to generation, especially from the third generation to the fourth generation, the parasitic effects of the magnitude of change, the egg block parasitism increased from 71.7% to 100% The parasitism rate increased from 17.3% to 64.5%. The average number of the fourth generation rice stem borer was only 7.8 per hatched. The high parasitic rate played a significant role in alleviating the late rice borer.