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一、识别和诊断 水稻从幼苗到抽穗的整个生育期中,稻株各部位都能遭受此病危害。由于发病的时期和部位不同,可分为苗瘟、叶瘟、节瘟、穗茎瘟和谷粒瘟。其中叶瘟、节瘟和穗茎瘟危害最大。 1.苗瘟 因秧苗受害时期不同,又可分为苗瘟和苗叶瘟两种。苗瘟多为种子带菌引起,发生在3叶期以前。种子发芽不久便可发病,先在病苗芽的基部和芽鞘上产生水渍状病斑,随后变成灰黑色。病苗上部呈淡红褐色而枯死,这种情况在旱育秧和半旱育秧的秧
First, to identify and diagnose rice from seedlings to heading throughout the growing period, all parts of rice plants can suffer from the disease. As the incidence of different stages and parts can be divided into seedling blast, leaf blast, section blast, ear stem blast and grain blast. Among them, leaf blast, festival blast and ear stem blast hardest hit. 1. Seedling blast due to different stages of seedling damage can be divided into two kinds of seedling blast and leaf blast. Seedling blast caused by bacteria, occurred in the 3 leaf before. Shortly after the seed germination can be disease, the first in the buds of buds and buds on the base of water-like stains, and then turned gray gray. The upper part of the sickness was pale reddish brown and died, this situation in the drought and semi-dry seedling transplanting seedlings