随着种植结构的调整,早稻恶苗病已在一些地区上升为主要病害之一,特别在一些地方推广干籽旱直播的稻区,更是有利于恶苗病的发生。恶苗病又名徒长病、公禾、标杆、扯旗等,在南北稻区每年都有不同程度的发生,尤其是未浸种及浸种效果差的田块,平均病蔸率为6.5%,病株率为1.3%,严重田病蔸率达40%～45%,病株率达9%～10.6%,严重影响早稻的产量。发病症状恶苗病因表现症状不同可分为四种类型:徒 With the adjustment of the planting structure, the early rice badger disease has risen in some areas as one of the major diseases. In particular, it is more conducive to the occurrence of the ill-foe disease in areas where the direct-seeded dry irrigated rice is popularized. Atypical disease, also known as long-term illness, public Wo, benchmark, pull the flag, etc., each year in the North and South rice have varying degrees of occurrence, especially in non-soaking and soaking poor plots, the average disease rate was 6.5% disease The plant rate was 1.3%, the rate of serious disease was 40% -45% and the rate of diseased plants was 9% -10.6%, which seriously affected the yield of early rice. Symptoms of disease caused by symptoms of different causes can be divided into four types: only