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随着耕作制度的改革,双三熟制水稻的发展,一代大螟有了繁殖为害的基地,发生量成倍增加,为害逐年上升。 近两年来,各地推广杂交水稻,为二代大螟提供了良好的食料和更加适宜的繁殖为害场所,大螟为害普遍比往年重。据调查,去年杂交稻田边三代螟害率一般为4％左右,严重的高达28.1％,已成为当前水稻生产上的一个突出问题。 为了消灭大螟为害,确保水稻高产稳产,去年我们对大螟发生为害情况进行了初步调查研究,现将结果整理于后。
With the reform of tillage system and the development of Shuangsan-cooked rice, the generation of Sesamia inferens has a base for reproduction and the occurrence of the Sesamia inferens doubled and the damage increased year by year. In the past two years, the promotion of hybrid rice in various places has provided a good food for the second generation of Sesamore and the more suitable breeding sites. The damage of Sesamia inferens is generally heavier than in previous years. According to the survey, the rate of the three generations of side-by-side hybrid rice paddy last year was generally about 4% and its seriousness was as high as 28.1%. It has become a prominent issue in current rice production. In order to eliminate the damage of Sesamia inferens, to ensure high and stable yield of rice, last year we conducted a preliminary investigation of the occurrence of Sesamia inoculation, the results are arranged in the post.