稻瘟病是由真菌引起的,现已知的稻瘟病种类有19种之多。水稻从发芽到收获期间都可能受到侵害。稻瘟病寄生在水稻的体内,由于寄生的位置不同,表现的症状也不同。根据发生的部位,分为菌稻瘟,叶稻瘟,节稻瘟、谷粒瘟、穗稻瘟。1.稻瘟病的症状识别整个生育期均可发生,根据被害部位不同,可形成苗瘟、叶瘟、节瘟、穗颈瘟和谷粒瘟等病害。1.1叶瘟一般于分蘖期以后发生,由于品种和气象条件不同,叶瘟有四种症状,除褐点型、白点型外,在田间常见的 Blast is caused by fungi. There are 19 species of blast known. Rice may be damaged from germination to harvest. Rice blast parasites in the body of rice, due to the different locations of parasites, the performance of the symptoms are different. According to the site, divided into bacterial blast, leaf blast, festival blast, grain blast, panicle blast. 1. Identification of the blast disease symptoms can occur throughout the growing period, according to the different parts of the victim can form blast, leaf blast, Festival blast, panicle blast and grain plague and other diseases. 1.1 leaf blast generally occurs after tillering stage, due to different species and weather conditions, there are four symptoms of leaf plague, in addition to the brown point type, white point type, common in the field