大棚蔬菜防病灭病的巧法是:一、韭菜。韭蛆防治:在扣棚以后要及时用25%敌百虫、40%敌敌畏、40%氧化乐果在韭菜的根部灌施一次。菲莱灰霉病的预防主要是注意放风、降温、降湿。温度要掌握在25～28℃;湿度在60～70%为 Greenhouse vegetable disease prevention and cure skill is: First, leeks. Leek maggots control: in the shed after the timely use of 25% trichlorfon, 40% dichlorvos, 40% omethoate in the root of the leek irrigation once. Feilai gray mold prevention is to pay attention to the wind, cooling, dehumidification. Temperature to be controlled at 25 ~ 28 ℃; humidity at 60 ~ 70% for