论文部分内容阅读
目前余姚县的连作稻地区,1963年以前本是以连作稻为主的连作稻、间作稻和单季晚稻混栽区。在原先的栽培制度下,虽然是大螟、二化螟、三化螟混合为害,但是以三化螟为主。近年来,为了提高单位面积全年产量,而发展成为单一的连作稻地区;与此同时,并逐步扩大了迟熟高产的早稻品种和提早了早稻的移栽期。在这一新的条件下,二化螟乘机抬头,近两年中已变为二化螟为主的局面,成为水稻继续大幅度增产的障碍。
At present, the continuous cropping paddy area in Yuyao County was a continuous cropping paddy field, intercropping paddy and single-season late rice paddy planting area dominated by continuous cropping paddy until 1963. In the original cultivation system, although the Sesamia inferens, Chilo suppressalis, three borer mixed damage, but mainly to three borers. In recent years, in order to increase annual output per unit area, it has developed into a single continuous cropping paddy. At the same time, the early rice varieties with late maturity and high yielding and early maturing rice transplanting periods have been gradually expanded. Under this new condition, the development of the rice stem borer has taken the lead in the past two years and has become the main cause of the rice stem borer, which has become an obstacle to continued large-scale increases in rice production.