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重庆市三化螟Tryporyza incertulas (Walker)每年发生四代,以第三代的发生量最大,危害最严重。 1976年我们在对第二代三化螟发育进度进行调查中,发现第三代三化螟的主要虫源田——中稻在收割完毕时(8月18日),田间幼虫化蛹率才27.3％,而此时诱蛾已有367头,占当年灯下第三代总蛾量378头的97.1％。当时晚稻田治螟工作已结束,可见这两代螟虫发育进度出现了极尖锐的矛眉,因此,我们对第二代三化螟发生滞育提出了怀疑。 1979年我市一些测报站重复作了这一工作,所得结果列表1。
Tryporyza incertulas (Walker) in Chongqing Municipality takes four generations each year, with the third generation occurring the most and harming the most serious ones. In 1976, we investigated the developmental progress of the third generation yellow rice borer and found that the larval pupation rate of the third generation third generation rice borer was 27.3% at the harvesting time (August 18) , While at this time there are 367 moths, accounting for 97.1% of the 378 heads of the third generation of moths under that year’s lights. At that time, the late paddy field rice borer work has ended, we can see the progress of the two generations of stem borers appeared extremely sharp spear, so we have diapause on the second generation of yellow rice borer doubt. Some stations in our city in 1979 repeatedly made this work, the results of a list.