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日本农林省农业技术研究所自1959—1963(昭和三十四年至三十八年)连续五年对土壤线虫进行防治试验。全国防治面积在昭和三十四年约为一万公顷,到昭和三十八年已达到三万九千公顷。此外,果树和一些多年生植物五年来防治面积也有所增加。对线虫危害的严重性,已普遍引起重视。一、线虫为害的鉴别①地上部分症状:首先是作物营养发生障碍,其症状如茎杆矮、生长缓慢、花期推
Japan’s Agriculture, Forestry and Fisheries Institute of Agricultural Technology from 1959-1963 (Showa 34 to 38 years) for five consecutive years of soil nematode prevention and control tests. The total area under national control was about 10,000 hectares in the 34th year of the Showa era and reached 39,000 hectares by the 30th year of the Showa era. In addition, the control area of fruit trees and some perennials has also increased in the past five years. The seriousness of nematode hazards has generally attracted attention. First, the identification of nematode damage ① parts of the symptoms: the first crop nutrition disorders, the symptoms such as short stems, slow growth, flowering push