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一、发生条件瓜菜苗期遇低温或明雨天气多,光照不足,田间湿度大,易受病原菌浸染;多年连作的保护地因病原菌残留量大,苗期发病严重;管理方式粗放、苗床保温性差,通风条件不良,幼苗长势弱,易发病。二、综合防治 (一)种子消毒。用OS-施特灵或3%广枯灵500倍液浸种(不需浸种的可将药液喷洒在种子表面,边喷边拌,以种子湿透为准),或拌种(先用少量水将种子湿润,然后加所需药拌匀,药量为种子量的0.3%～0.5%),不仅可杀死种子所带病菌,还可提高其发芽率,促进其发新根,增强幼苗的抗逆能力,能有效预
First, the occurrence of conditions Vegetable seedlings encounter low temperature or rainy weather, lack of light, field humidity, susceptible to pathogen infection; for many years as a result of the protection of large residual pathogen, seedling incidence; extensive management, seedbed insulation Poor sex, poor ventilation, seedlings grow weak, easy to disease. Second, comprehensive prevention and treatment (a) seed disinfection. Use OS-Stirling or 3% Kwong Ling 500 times soaking (do not need to soaking the liquid can be sprayed on the surface of the seed, while the side spray mixed with wet seeds prevail), or seed dressing (first with a small amount Water will be wet seeds, and then add the desired drug mix well, the amount of seed for the amount of 0.3% to 0.5%), not only can kill the seeds of bacteria, but also improve the germination rate, promote their hair roots, enhance seedlings The resilience, can effectively pre-