水稻白叶枯病由越冬带菌杂草的传病,是防治上的一个关键问题。为了探讨江苏省扬州地区杂草带菌和越冬后的传病作用,作者于1979～1983年作了这项研究,结果如下:一、试验材料和方法1.浓缩针刺接种在发病期间取发病较重的早中稻田采集田边、沟边的杂草以及前荏为发病稻田的麦田杂草与稻根进行带菌测定,共采集杂草4科20种,其中旱地杂草12 The bacterial blight of rice is caused by overwintering weeds, which is a key problem in prevention and control. In order to investigate the weeds in Yangzhou, Jiangsu Province and the pathogenic effect after overwintering, the author made this study from 1979 to 1983, the results are as follows: First, the experimental materials and methods 1. Concentrated acupuncture vaccination during the onset of disease incidence The heavy early-mid-season paddy fields collected the weeds in Tianbian and Mianbian, and the frontal weeds were used for the determination of the weed and rice roots in the infested rice fields. A total of 20 species of weeds were collected from 4 families, of which dry weeds 12