发展杂交水稻是提高粮食产量的一项战略性措施,影响深远。近年来,杂交稻的种植面积不断扩大,产量逐年上升,预计今后种植面积还将大幅度增加,其前景十分喜人。然而,随着杂交稻的扩大种植,其病虫的发生为害与常规稻比较,出现了一些新的情况。现将我们多年来调查研究的主要情况及? The development of hybrid rice is a strategic measure to increase food production and has far-reaching implications. In recent years, the hybrid acreage has been continuously expanded and the output has been increasing year by year. It is estimated that the planted area will also increase significantly in the future, and the prospects for this are very promising. However, with the expansion of hybrid rice cultivation, the occurrence of pests and diseases compared with conventional rice, there have been some new situations. Now we investigate the main situation over the years and?