近年来,大棚西瓜因效益好其种植面积逐年扩大,在栽培过程中发现根结线虫病的危害日趋严重。据调查,连续种植三年以上的棚室西瓜,发病株率高达35%~95%,一般减产20%~30%,严重的达50%以上。根结线虫病的危害已成为大棚西瓜生产发展的重要障碍之一。现将其发生与防治方法介绍如下: In recent years, the greenhouse watermelon due to the benefits of its planting area expanded year by year, found in the cultivation of root knot nematodes disease hazards are increasingly serious. According to the survey, watermelons grown in greenhouses of more than three years in a row have an incidence rate of 35% -95%, generally reduced by 20% -30% and seriously increased by 50% or more. The damage of root knot nematode has become one of the most important obstacles in the development of watermelon production in greenhouse. Now its occurrence and prevention methods are described below: