稻曲病是由稻曲霉病菌(绿核菌属真菌)引起的病害。这种病害在水稻生长发育良好的年份发生生严重。在南方稻区农民称它为“丰年谷”而易忽视防治。随着杂交晚稻在晚稻生产中的比例越来越大,该病已在杂交晚稻后期普遍发生,且逐年加重,危害加大。据湖南省沅江市近几年的调查,杂交晚稻穗发病率为5%～15%。重病田块高达20%～35%左右。一般减产一成左右,严重的减产二成以上,并且混入有毒的曲粒污染了稻谷米粒,是一种不可忽视的晚稻病害。 False Smut is a disease caused by Aspergillus oryzae (Mycological fungus). This disease is serious in the years when rice is well-developed. Farmers in the southern rice area called it “Feng Nian Valley” and neglected prevention and control. With the increasing proportion of hybrid late rice in late rice production, the disease has occurred generally in the later hybrid late rice and has been increasing year by year. According to the survey of Yuanjiang City in Hunan Province in recent years, the incidence of hybrid late rice spikes is 5% to 15%. Illness block up to 20% ~ 35%. About 10% is generally cut, about 20% of them are severely cut, and mixed with poisonous grain contaminates rice grains, which is a kind of late rice disease that can not be neglected.