纹枯病是水稻生产中的常发、普发性病害,尤其在长江以南稻区,可以说在早稻生产上几乎是一种年年重发的病害,每年都需要在早稻生长阶段重点组织2次左右的防治安排,方可基本控制危害,而忽视防治的地方,因该病的危害造成的减产损失一般为10%~15%左右,严重的减产达50%以上。重发原因近些年来,因稻秧密度的增加,尤其是在直播 Rhizoctonia solani is a common and generalized disease in rice production, especially in the rice fields south of the Yangtze River. It can be said that it is almost a year-by-year recurrence disease in the early rice production. Every year, 2 times or so before they can basically control the harm and neglect the place of prevention and control. The yield loss caused by the damage of the disease is generally about 10% to 15% and the serious reduction of output is over 50%. Reasons for recurring In recent years, due to an increase in the density of rice seedlings, especially in the live broadcast