绵疫病,又名褐色腐败病,是番茄上重要病害之一,我国南北菜区均普遍分布,露地番茄上发生较重,主要在6～8月高温期下大雨后发生,引起果实腐烂(彩色图版1)。北京地区自2008年6月13日普降大雨以来,雨天接连不断,空气十分潮湿,番茄绵疫病大面积发生,一般田块病果率30%～40%,重病田达 Mian Phytophthora, also known as brown rot disease, is one of the important diseases on tomato. Our country’s northern and southern vegetable areas are generally distributed. Occurrence of heavy tomato in open field mainly occurs after heavy rain from June to August under high temperature, causing fruit rot (color Plate 1). Beijing since June 13, 2008 since the heavy rains, rainy after another, the air is very humid, large areas of tomato leaf blight occurred, the general field disease rate of 30% to 40%