稻曲病(俗称鸡屎谷)以往只在少数晚稻田中发生,且病穗率很低,对产量影响不大。但近年其发展呈上升趋势,早发病的丘块在9月下旬就可见到病粒。一般发病田块病穗率为1％～3％,病穗上的病粒一般为2粒～7粒;少数发病重的 False false smut (commonly known as chicken feces Valley) in the past only occurred in a small number of late rice fields, and disease panicle rate is very low, little impact on the yield. However, its development has been on the rise in recent years. Early onset of disease can be seen in late September. Diseases of the general incidence of disease panicle rate of 1% to 3%, disease panicle is generally 2 to 7 tablets; a few serious cases