柑桔根线虫病(Tylenchulus semipenetrans)1921年由Hodges,J.R.在美国的一个甜橙园第一次发现,其分布几乎遍及世界柑桔产区。我国李来荣于1935年首次在国内对该病进行了研究,尔后陆续出现报道,但均属定性描述。为了摸清该病在四川省柑桔产区的发生情况及为害程度,我们试图从定量角度进行调查研究,并在此基础上,对重病园开展药剂防治试验。现将结果整理如下。 Tylenchulus semipenetrans was first discovered by Hodges, J.R. in a sweet orange orchard in the United States in 1921 and distributed almost everywhere in the world. Li Lai-rong in China in 1935 for the first time in the country conducted a study of the disease, followed by reports one after another, but are qualitative description. In order to find out the occurrence of the disease in the citrus producing areas of Sichuan Province and the degree of harm, we tried to carry out investigation and study from a quantitative point of view, and on this basis, we carried out chemical prevention and control trials in the Park of Severe Illness. The results are now organized as follows.