前言日本冬、春低温季节会发生洋葱细菌病,曾有人报导是二种病害。一种是由 Pseudomonas引起的春腐病。另一种是由 Bacterial 引起的斑点细菌病。但近年来在东海和近畿地方的秋播洋葱上发生春腐病和斑点细菌病合并症为害严重。经分离鉴定查明该病是由 Erwinia 以 Foreword Onion bacterial disease occurs in Japan’s winter and spring low temperatures. It has been reported that there are two kinds of diseases. One is spring rot caused by Pseudomonas. The other is Bacterial bacterial disease caused by spot. In recent years, however, severe complication of spring rot and spot bacteriosis occurred on the autumn onion in the East China Sea and Kinki areas. Identified by isolation and identification of the disease by Erwinia