柑桔类植物的线虫病,普遍发生于世界各柑桔产区,引起柑桔“缓慢性衰退”,影响柑桔生产。据记载侵染柑桔的病原线虫共有20余种,其中以柑桔根线虫(Tylenchus semipenetrans)最为常见。1935年广东曾报导此种线虫为害柑桔,因此,长期以来也认为柑桔根线虫是我国柑桔线虫病的主要病原。1972年起,我们对广东省主要柑桔产区进行调查,对病原线虫进行了分类鉴定,未发现上述线虫为害和寄生。广东柑桔的线虫病,主要是根结线虫(Meloidogyne sp.)侵袭柑桔根部引起。近年来,国外曾用二溴氯丙烷(DBCP)防治柑桔根线虫,取得理想的效果。在国内未做过 Nematode diseases of citrus plants generally occur in various citrus producing areas in the world, causing “slow decline” in citrus and affecting citrus production. It is reported that there are more than 20 pathogenic nematodes infecting citrus, of which Tylenchus semipenetrans is the most common. In 1935, Guangdong reported that this species of nematode harm citrus, citrus nematodes have long been that citrus nematode disease is the main pathogen. Since 1972, we conducted a survey of the main citrus producing areas in Guangdong Province, and classified and identified pathogenic nematodes. We did not find these nematodes harmful and parasitic. Nematode disease in Guangdong citrus is mainly caused by Meloidogyne sp. Infestation of citrus roots. In recent years, foreign countries have used dibromochloropropane (DBCP) to prevent citrus rootworm, and achieved the desired results. Not done in the country