一、猝倒病(一)危害症状:猝倒病俗名绵腐病、小脚瘟,是蔬菜苗期的主要病害。发病初期病苗茎基部呈水渍状,淡绿色至黄褐色,后期病部溢缩成线状,幼苗倒地死亡,在高湿条件下,在病苗残体和附近土表长出白色绵毛状霉层。(二)防治措施:1、搞好种子消毒。播种前先用40%拌种双可湿性粉剂或58%瑞毒霉锰锌可湿性粉剂拌种。其比例为0.3%～0.4%;2、选择地势较高、前作无病源,排水良好的田块作苗圃,并做好防寒保温和 First, the damping-off disease (A) Harm symptoms: damping-off disease common cotton rot, small foot plague, is the main disease of vegetable seedlings. In the early stage of the disease, the base of the diseased seedlings showed a water-stain, light green to yellow-brown, and the latter part of the disease was spilled into a linear shape. The seedling fell to the ground and died. Under high humidity conditions, Trichoderma mold layer. (B) control measures: 1, do a good job of seed disinfection. Before sowing with 40% seed dressing double wettable powder or 58% refectoria mold manganese zinc wettable powder dressing. The proportion of 0.3% ~ 0.4%; 2, select the higher terrain, before the disease-free, well-drained fields for nursery, and good cold insulation and