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近些年来,随着小麦栽培管理条件的变化,水、肥用量增大,田间植株密度增多,引起小麦白粉病逐年加重。为搞好小麦白粉病的预测和防治,我们进行了小麦白粉病的流行动态规律的研究,并在此基础上探讨对白粉病的预测预报方法。现将结果报告如下。一、材料和方法1.田间系统调查和普查:在小麦拔节始期(我省中南部4月初、北部4月中下旬)开始,选水肥条件好,易感病麦田2～3块慢步踏查,发现病株时开始定点,每块地取样5点,每点查100株,共查500株,5天查一次。记载病叶数、病叶率、病茎率,目测严重度,计算出病情指数。
In recent years, with the change of wheat cultivation and management conditions, the amount of water and fertilizer increased, and plant density increased in the field, causing the wheat powdery mildew to increase year by year. In order to improve the prediction and control of wheat powdery mildew, we conducted a study on the prevalence of wheat powdery mildew and based on this study, we discussed the prediction method of powdery mildew. The results reported below. First, materials and methods 1 field system survey and census: Beginning of the wheat jointing (central and southern provinces in early April, the northern part of the middle and late April), the election of water fertilizer conditions are good, susceptible to disease 2 to 3 rodent When the diseased plants were found, they were spotted, and 5 samples were taken from each spot. 100 plants were examined for each point, and 500 plants were examined for 5 days. Record the number of sick leaves, sick leaves rate, disease stem rate, visual severity, calculate the disease index.