茶苗根结线虫病又称茶根瘤线虫病,一般发生在苗圃,以一年生实生苗受害最重。为害茶苗常出现叶片发黄、脱落、根系产生瘤状虫瘿,主根弯曲,顶端粗大,无须根或很少须根,严重患病时全株枯死。由于此病症状与缺肥、缺水及螨类危害引起的症状很相似。因此,有些茶农常把此病误诊为缺肥、缺水及螨害,于是造成防治不及时,或措施不对头,以致影响了茶叶生产的发展。 据观察,此病发生与土壤的温湿度、土质、苗龄和品种,耕作栽培以及肥料,微量元素等有密切关系。据此,在防治上可采用以下几项措施。①选用抗病或耐病的优良品种;②尽可能选择无线虫的生荒地育苗或定植,③利用绿肥作物大叶绿豆对根结线虫的易感 Tea root knot nematode disease, also known as tea root knot nematode disease, generally occurs in nurseries, annual live births most affected. Harm the leaves of tea plants often appear yellow, fall off, the root produces nodules nodules, the main root is curved, the top of the coarse, no roots or few fibrous roots, serious illness when the whole plant died. Symptoms due to the disease and lack of fat, water and mite hazards caused by the symptoms are very similar. Therefore, some tea farmers often misdiagnose the disease as lack of fertilizer, water and mite damage, resulting in the prevention and treatment not timely, or the wrong measures, which has affected the development of tea production. It is observed that the disease occurs with the soil temperature and humidity, soil, seedling age and variety, cultivation and cultivation, as well as fertilizers, trace elements are closely related. Accordingly, in the prevention and control can use the following measures. ① selection of disease-resistant or disease-resistant elite varieties; ② as far as possible selection of non-wild insect nursery nursery or colonization, ③ the use of green manure Mung bean on the susceptibility to root knot nematode