近几年,随着温室大棚番茄种植面积的不断扩大和常年的连作,使得根结线虫在番茄上发病越来越重,因患病造成的减产一般在50%左右,已成为保护地蔬菜的主要病害之一,菜农应注意防治。一、病害症状患有根结线虫的番茄植株生长缓慢、黄弱,有时中部叶片萎蔫,严重时下部叶片黄枯而死。挖出病株根部,可见主根朽弱,侧根和须根上形成许多根结,俗称“瘤子”。根结大小、形状不一,始为白色,质地柔软,后变淡灰褐色,表面有时龟裂。剖开根部可见极小的乳白色雌线虫。 In recent years, with the growing area of ​​tomato growing in greenhouse and perennial continuous cropping, root knot nematode is getting more and more serious in tomato, the yield reduction caused by disease is generally about 50%, which has become a vegetable in protected area One of the main diseases, vegetable farmers should pay attention to prevention and treatment. First, the symptoms of the disease suffering from root-knot nematode tomato plants grow slowly, yellow weak, and sometimes the central leaves wilting, the lower part of the leaves seriously yellow dead. Digging diseased roots, we can see the main root of weak, lateral roots and fibrous roots formed on the root, commonly known as “tumor.” Root knot size, different shapes, beginning to white, soft texture, pale gray-brown later, the surface sometimes cracked. Cut open the root visible milky white female nematode.