根据直接间接调查、试验和多方联系及查阅有关资料结果,初步了解我国稻麦等粮食作物的矮缩病分布于西北、华南和西南、华北、华东22个省、市、和自治区,发病面积估计在2000万亩左右,病害名称不下30余种,其中接近半数都是最近几年内新找到的病害,且相当大的一部分病害已初步证实为病毒性矮缩病。这类病害,在不同年份不同地区,同一年份不同地区,或同一地区不同年份,分别的引起不同程度的危害性,甚至突然袭击,严重的威胁着农业生产。要控制所谓病害流行年份的大流行,防止突然袭击,和在平常发病年份使之不影响稳产高产,必须在党的领导下,深入实际,深入生产,深入群众,针对不同年份不同地区等的病因及影响发病条件,进行较长期的调查和试验分析。从我们现有的资料初步了解到:第一,不同稻麦品种的抗病性不同,甚至同一品种(在分离时)的不同分离系的抗病性 According to the results of direct and indirect investigation, experiment and multi-factor correlation and referring to relevant data, it is preliminarily understood that dwarfing diseases such as rice and wheat in China are distributed in 22 provinces, cities and autonomous regions of Northwest, South and Southwest China, North China and East China. About 20 million mu of disease name no less than 30 species, of which nearly half of the newly discovered diseases in recent years, and a considerable part of the disease has been initially confirmed as viral dwarf disease. These kinds of diseases cause different degrees of harm or even surprise attacks in different regions of different years, different regions of the same year or different years in the same region, which seriously threaten agricultural production. To control the so-called epidemic years of the pandemic, to prevent sudden attacks, and in the normal year of disease so that it does not affect stable and high yield, we must, under the leadership of the party, deepen the actual, in-depth production, in-depth the masses, in different regions of different etiology And affect the incidence of conditions, the more long-term investigation and experimental analysis. From our existing data, we have initially learned that firstly, the disease resistance of different rice varieties is different, and even the disease resistance of different isolates of the same variety (at the time of isolation)