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三化螟Tryporyza incertulas(Walker)是本地区水稻的主要害虫,其发生数量的变动,一直为人们密切注意。六十年代初以前,对三化螟的猖獗因素,曾有过不少研究。许多研究都指
Tryporyza incertulas (Walker) is a major pest of rice in the region. The occurrence and variation of its number have always been closely watched by people. Before the early 1960s, there had been quite a few studies on the rampant effects of the three rice borers. Many studies mean