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水稻白叶枯病是我县主要病害之一,在沿河低洼地区发病普遍,损失严重。为了提高白叶枯病药剂防治效果,我们于1979—1981年在老病区石鼻乡古楼村用噬菌体法进行发病预测,现将结果简报如下。一、噬菌体数量与病害发生关系1.当测得每毫升田水中噬菌体数量为 400个左右后约过一星期田间可以出现中心病株,此时,田水中噬菌体数量增至每毫升800个。田间始病后,噬菌体数量随病害的发展而增加。此地晚稻有两个发病高峰,第
Rice bacterial leaf blight is one of the main diseases in our county. It is common in low-lying areas along the river and losses are serious. In order to improve the efficacy of the control agent against bacterial leaf blight, we used the phage method to predict the onset of disease in 1979-1981 in Gu Lou Village, Shi Nao Township, the old ward. The results are summarized as follows. First, the relationship between the number of phages and disease 1. When measured per milliliter of field water phage number of about 400 after about a week can appear in the field of diseased plants, at this time, field water phage number increased to 800 per milliliter. After the onset of disease in the field, the number of phage increased with the development of the disease. Late rice here has two peak incidence, the first