根结线虫病广泛分布,寄主范围达到2000多种,瓜类是根结线虫的重要寄主,几乎所有的葫芦科作物都是其危害的对象。主要危害寄主植物的叶片、花苞和花朵,造成叶片黄化、落叶、小叶或叶片畸形。心苞受害致枯心或空心,在开花时往往出现花腐,根部肿大畸形呈鸡爪状,根组织变黑腐烂,也有的根上产生球状根结。线虫侵入根部后,细根及粗根各部位产生大小不一的不 Root-knot nematodes are widely distributed, the host range to reach more than 2000 kinds of melons are root knot nematode important host, almost all the Cucurbitaceae crops are the object of their harm. The main damage to the host plant leaves, buds and flowers, resulting in yellow leaves, leaves, leaflets or leaf deformities. Heart blight caused by dead or hollow heart, flowers tend to flowering at the time of bloom, root abnormalities were chicken claw-like, black rot of the root tissue, and some roots produce spherical root knot. Nematodes invade the roots, fine roots and coarse roots of various parts of different sizes do not