11月开始入冬,气温明显降低,冬季蔬菜生产真正开始。保护地蔬菜的棚室栽培环境虽然相对封闭,但病虫害发生与外界的气候条件仍有密切的关系。根据近十年的气象观察,河北省11月至来年3月天气经常是连日大雾,造成 Beginning of winter in November, the temperature dropped significantly, winter vegetable production really started. Although the vegetable cultivation environment of protected vegetables is relatively closed, the occurrence of pests and diseases is still closely related to the climatic conditions of the outside world. According to nearly a decade of weather observations, Hebei Province in November to March the weather is often heavy fog, causing