水稻恶苗病,俗称公禾、米禾等,是由于恶苗病的分生孢子,在水稻开花时侵染颖壳而得病,苗期发病,病苗细长,叶色淡绿,比健株高1/3。本田常在移栽后一个月左右发病,病株叶片和叶鞘窄长,根系发育不良,分蘖极少,叶色淡绿,节间显著仲长,发生许多倒生须根,节部和叶鞘上常长出暗红色霉菌。病株多在孕穗前枯死,少数能抽穗,但穗短,粒少,瘪粒多,病种有的不发芽,或发芽后不久便枯死。近年发病面 Rice Bakanae disease, commonly known as the public Wo, Mi Wo, etc., is due to the conidia of the Bakana disease, in the flowering rice infested gills and sick, seedling disease, slender seedlings, leaf color light green than the healthy Plant height 1/3. Honda often transforms in about one month after the onset of diseased plants leaves and leaf sheaths long and narrow, poorly developed root system, very few tillers, leaf color light green, internode significantly longer, a large number of invertebrate roots, nodes and sheath often Dark red mold grows. Most of the diseased plants die before the booting, a few can heading, but short ears, fewer grains, shrunken grains and many diseases do not germinate, or die soon after germination. In recent years the incidence