小麦条锈病防治指标的初步研究

The Initial Study of Economic Injury Level(EIL) of Stripe Rust of Winter Wheat

通过对不同小麦品种的产量损失预测,根据损失的程度,将感病品种分为比较耐病品种、一般感病品种及特别敏感型品种。研制了用普遍率转换病情指数的Inc-Ind模型,认为二者的关系用Weibull模型拟合较好。研究结果表明,病害防治指标的确定,以小麦扬花期普遍率低于30％、旗叶始见期在4％时较为适宜。并且根据田间实查的病情推算出病害防治指标的方法,编排了实用的计算机程序。

Through the prediction of yield losses of different wheat varieties and on the bases of losses caused by disease, the susceptible varieties of winter wheat to stripe rust were divided into general susceptible, severe susceptible and more tolerant varieties in the experiments. The Inc-Ind model of general index of disease conversion was developed, and the Weibull model was considered as the better fit for the relationship between disease incidence and disease index. The result of the experiment showed that the determination of Economic Injury Level (EIL) is less than 30% at the beginning of the blooming period or 4% when the last leaf is visiable. The author also worked out a computer program to culculate the EIL and suitable period for control the disease.