近年来,西瓜生产受到一种新病害——根结线虫病的严重为害.从一九八一至一九八二年,笔者分别在建阳县和长乐县对该病发生及为害情况作了调查,结果见表一.建阳仅良种场一地,就有两大片瓜地因根结线虫病而西瓜几乎死光.长乐县的为害情况更加严重,发病面积相当广,几乎所有的老瓜区,如潭头、金峰、文岭、湖南、漳港等公社几千亩瓜地均严重发病;仅少数新区如旧县、文武砂等公社病情较轻.由于该病严重为害,造成西瓜产量大幅度下降,一般损失30～40%,严重的达70～80%,甚至毁国绝收. In recent years, watermelon production has been severely damaged by a new disease, root-knot nematode disease. From 1981 to 1982, the author made separate observations on the occurrence and the harms of the disease in Jianyang County and Changle County, respectively Survey, the results shown in Table 1. Jian Yang only seed market, there are two large pieces of melon due to root-knot nematode and watermelon almost dead light. Changle County, the more serious damage, the incidence of a fairly wide area, almost all of the old melon Areas such as Tantou, Jinfeng, Wenling, Hunan and Zhanggang communes have a serious incidence of several thousand mu of melon land; only a few new areas such as the old county and the Wenwu sands are less serious due to the serious damage caused by the disease, resulting in the production of watermelon A sharp decline, the general loss of 30 to 40%, a serious up to 70 to 80%, or even destroy the country must.