水稻孕穗抽穗期二化螟和三化螟被害株的区别

• 作 者: 谢明全
• 机 构: 四川省阆中县农业局
• 出 处: 植物保护
• 发表日期: 1989年05期
• 关键词: 田间观察 羽化孔 虫孔 茎节 虫粪 入孔 节间 细粒状 茎杆 微带

我县改种1季中稻后,稻螟一直以二化螟为优势种,但1983年以来,三化螟数量逐年上升,1987年全县50％的区、乡三化螟比例达80％以上。为了准确估计田间危害程度,经过大量田间观察,一代被害株根据有无枯鞘和羽化孔特征进行鉴别,现提出穗期二化螟与三化螟危害状的3点区别。

Rice borer has been the dominant species of rice stem borer after one season of mid-season rice replanting in our county. However, since 1993, the number of yellow rice borer has risen year by year. In 1987, 50% of district and township borealis borealds accounted for more than 80% . In order to accurately estimate the degree of harm in the field, after a large number of field observations, a generation of victims were identified according to the presence or absence of dead-sheath and eclosion hole characteristics. The differences between the three stem borers at the heading stage and those of the three stem borers were proposed.