稻瘟病是我省水稻生产上一个常发性的主要病害,而水稻品种对稻瘟病的抗病性,又往往因病菌小种的变迁以及气候和栽培条件的差异,在地区、年度、季节间具有不同的表现,经常会发生开始是抗病的品种,但经过几年栽培或引入其他地区后,又“突然”变为感病。 Rice blast is a frequent main disease in rice production in our province. However, the resistance of rice cultivars to rice blast is often affected by the change of races and the difference of climate and cultivation conditions. With different manifestations, it is often the case that varieties that begin with are resistant to disease, but after years of cultivation or introduction elsewhere, they “suddenly” become susceptible.