The disease severity decreased as light transmittance ratio of the canopy at heading (LTR) increased.The LTR, Tav and RH explained 80.2% of variation in disease severity.

• 纹枯病病情指数随着抽穗期群体透光率的提高而下降，由日平均温度、相对湿度和抽穗期群体透光率可以解释纹枯病病情指数变异的80.；2%25。