大棚内蔬菜所需的光和热来自阳光的辐射,夜间温度的维持靠白天积蓄的热量,当遇到不良的气候条件致使棚室温度不适,而保温措施或通风降湿又不适当时,蔬菜叶片生长容易受害,呈现各种症状,如误诊,尤其误诊为侵染性病害,就会导致不合理用药,给菜农造成一定的损失。 The light and heat required by the vegetables in the greenhouse are radiated from the sunshine. The nighttime temperature is maintained by the heat accumulated during the day. When the weather conditions in the greenhouse are not suitable for the greenhouse temperature and the insulation measures or ventilation and dehumidification are inappropriate, Growth is easy to suffer, showing various symptoms, such as misdiagnosis, especially misdiagnosed as invasive diseases, will lead to irrational use of medicine, to vegetable farmers caused some losses.