青菜病毒病,人们通常叫它“坏菜”。病的症状是起初菜的叶表面及边缘发黄,根系发育不好,以后根的基部开始腐烂,发展到整棵青菜烂掉。在一九七四年秋,由于长期阴雨,光照不足,从10月份开始发生坏菜,一直延续到今年一月份。这次坏菜时间长,来势猛,速度快,范围广,是历史上少有的。发病品种从青菜扩大到草头、早菠菜、早茼蒿等叶菜,大大影响了当时蔬菜的市场供应和质量。 Greenhouse virus disease, people often call it “bad dish.” The symptom of the disease is that the leaf surface and the edge of the dish are yellow at first, and the root system is poorly developed. Afterwards, the base of the root begins to decay and develops to the entire vegetable rotting. In the autumn of 1974, due to long periods of overcast and rainy weather, bad dishes started from October and lasted until January this year. The bad dishes for a long time, fierce trend, fast, wide range, is rare in history. Incidence of vegetables from the expansion of the grass to the head, early spinach, leafy early Amanita and other vegetables, greatly affected the time the market supply of vegetables and quality.