In the greenhouse seedling stage of the greenhouse, the tip of the blade was found to droop, and the color of the green or the edge of the cotyledon turned white and curled upwards, which was caused by sudden cooling in the greenhouse. In the production, according to the weather changes, spray a new high-fat film to form a layer of polymer film insulation, and do a good job of insulation and cold protection. If the tip of the blade is yellow, it may be caused by lack of water or excessive water application in the soil, which is caused by physiological water shortage. If the leaves are shrunk during the flowering period, the leaf flesh becomes thicker, the leaves are light yellow and dull, and most of them are caused by the temperature in the greenhouse being too low. In severe cases, the leaf margin turns white. In production, insulation should be strengthened to ensure the normal growth and development of the plant. At the same time, it is necessary to cultivate several times to increase the ground temperature and increase the heat capacity in the greenhouse. If the leaves are curled upwards and the leaves are light yellow, the temperature in the shed is too high and the air humidity is too high. This phenomenon occurs mostly in cucumbers. Early stage
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