番茄晚疫病是一种流行性很强的真菌病害。近年来,随着各地棚室的迅速发展,危害越来越重,一般减产20～30%,严重的可造成绝收。番茄晚疫病主要为害叶片和果实,河北省各地可周年发生,棚室内一般3月份出现中心病株,中心病株多发生在棚室地势低洼或结露处,条件适宜时迅速扩展蔓 Late blight is a highly epidemic fungal disease. In recent years, with the rapid development of greenhouses in various places, the harms are getting heavier and heavier. Generally, the output is reduced by 20% to 30%, which can lead to serious accidents. The tomato late blight is the main damage leaves and fruit, all around Hebei Province can occur annually, shed indoor centers in March generally appear diseased plants, the center of the disease occurred in the shelter low lying or condensation place, when appropriate, the rapid expansion of vine