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稻瘟病是我省水稻生产上的主要病害之一,流行年份减产幅度很大。为培育高产抗病良种,近年来,各育种部门都致力于从选择广谱高抗的抗源入手。但所选用的试材大多未曾用本省小种测定其抗谱,这给选择抗源,针对小种育种带来很大困难。为了提高水稻产量,都在进行频繁的引种,更换品种。然而,有的品种异地种植后,由于不抗稻瘟病造成减产;有的抗病品种连续种植3～5年后抗性即丧失。国内外研究表明,这是由于水稻的抗瘟性与稻瘟病菌生理小种的致病性密切相关,而品种抗性维持久暂又与品种对不同小种的抗谱有
Rice blast is one of the main diseases of rice production in our province. The epidemic year is greatly reduced. In order to breed high-yield and disease-resistant varieties, in recent years, all breeding departments have been devoted to starting from the source of broad-spectrum and high-resistance choice. However, most of the selected test material has not been used in this province race to determine its anti-spectrum, which gives the choice of anti-source, breeding for races brought great difficulties. In order to improve rice production, are frequently introduced, changing species. However, some cultivars are planted off-site, resulting in loss of yield due to non-resistance to rice blast; resistance of some resistant varieties is lost after 3 to 5 years of continuous planting. Domestic and foreign studies show that this is due to the blast resistance of rice is closely related to the pathogenicity of physiological races of Magnaporthe grisea, while the resistance of cultivars is maintained for a long time and the resistance spectrum of cultivars to different races