水稻白叶枯病发生流行与气象条件关系及预测模型研究

为了明确气象条件与水稻白叶枯病发生的关系,提高预报能力,利用1985—2015年化州市晚稻白叶枯病病情资料及气象数据进行相关性分析。结果表明：9—10月降水量、降水日数、相对湿度、台风与发病程度呈正相关;日照时数、气温与发病程度呈负相关。影响白叶枯病发生的关键气象因子分别是8月中旬—9月中旬降水量、9—10月降雨系数、8月下旬降水强度和9月台风次数。采用逐步回归统计方法建立晚稻白叶枯病发病程度气象等级预测模型,模型的复相关系数R为0.9000,通过α=0.01的显著性检验。模型拟合准确率为89.4%。利用该模型对2016—2018年白叶枯病发生等级进行试报检验,平均试报准确率达93.3%。模型拟合结果和试报准确率均较好,为白叶枯病的综合防治及科学决策提供了依据。

Rice Bacterial Blight: Relationship Between the Epidemic and Meteorological Conditions and Its Prediction Model

The paper aims to clarify the relationship between meteorological conditions and the occurrence of rice bacterial blight, and to improve the ability to predict the occurrence of the disease. Based on the data of late rice bacterial blight and the meteorological data in Huazhou during 1985- 2015, we conducted the correlation analysis. The results showed that: the precipitation, rainy days, relative humidity and typhoon from September to October were positively correlated with the degree of disease; the sunshine duration and temperature were negatively correlated with the degree of disease; the key meteorological factors affecting the occurrence of bacterial blight were precipitation from mid-August to mid-September, precipitation coefficient from September to October, precipitation intensity in late August and typhoon frequency in September. We established the prediction model of meteorological grade for the incidence degree of late rice bacterial blight by the stepwise regression statistical method; the multiple correlation coefficient R of the model was 0.9000, which passed the significance test of a=0.01; the fitting accuracy of model was 89.4%; the average test accuracy of the occurrence level of bacterial blight during 2016-2018 by the model was 93.3%. The model fitting results and the test accuracy are good, providing the basis for scientific decision-making on the comprehensive control of rice bacterial blight.