西瓜根结线虫病,是由线虫侵染引起的线虫病害。它危害西瓜的根部,以侧根、须根受害最重。笔者在山东昌乐、寿光、青州等县市的西瓜主产乡镇调查,种植西瓜10年以上的棚室占70%左右,其中有半数棚室达20年以上。这些老龄西瓜棚室多数都有线虫病发生,一般因病减收20%左右,重者减收50%以上,甚至绝收。该病除危害西瓜外,还危害番茄、甜瓜、黄瓜、茄子、莴苣、菜豆、芹菜、甘蓝等作物,已成为瓜类和多种蔬菜根部的主要病害。一、危害症状和发病特点。受害西瓜根系产生球形或圆锥形大小不等的 Watermelon root-knot nematode disease, nematode disease caused by nematode infection. It harms the roots of watermelon to the lateral roots, fibrous roots most affected. In Shandong Changle, Shouguang, Qingzhou and other counties and cities of the main watermelon township survey, planting watermelons more than 10 years of the studio about 70%, of which half of the studio for more than 20 years. Most of these elderly watermelon sheds have nematode disease, the general reduction of about 20% due to illness, severe reduction of more than 50%, or even absolute. In addition to endangering the watermelon disease, the disease also endangered tomatoes, melons, cucumber, eggplant, lettuce, beans, celery, cabbage and other crops, has become the main diseases of melons and a variety of vegetable roots. First, the risk of symptoms and disease characteristics. Suffering watermelon roots produce spherical or conical sizes