The cause of yellowing of the leaves of P. lucidum is related to moisture, light, fertilizer and insect pests. If it is caused by improper watering, adjust the number of watering. If the light is too strong or too weak, move the plant to a location with gentle ventilation. If it is caused by improper fertilization, appropriate fertilizers are needed. If affected by insects, insecticides are used to kill the plants.
The yellowing and cyanosis of the leaves of Fructus paulownia may be caused by improper watering. During the growth of the fruit, the potting soil is usually dried and then watered. Too much water will rot the roots, too little water, and the leaf tissue will be damaged under the condition of lack of water, resulting in yellowing and cyanosis of the leaves. Appropriate amount of watering should keep the potting soil moist in spring and autumn, and increase the amount of watering in summer, and keep the potting soil dry in winter.
Improper lighting of Fructus lucidum will cause the leaves to turn yellow and cyanosis. You need to move the plants to a suitable position, and place the plants in mild sunlight to receive the light and avoid direct sunlight. Excessive light will burn the leaves. Insufficient light will affect the photosynthesis of plants. Under long-term lack of light and strong light, the plants will lose their ability to absorb water, gradually turn yellow, and eventually dry out.
The yellowing and hairpinning of the leaves of P. lucidum is related to fertilizers, and proper fertilization is needed. Lack of fertilizer can make plants malnourished and leaves yellow. Excessive fertilizer will damage the roots, affect the plant's absorption of nutrients, and the leaves will dry up and turn yellow. It is best to fertilize reasonably, once every 30 days in spring and autumn, once every 1 to 2 months in summer, and stop fertilizing in winter.
The yellowing and pupae of the leaves of P. lucidum may have been affected by insect pests, and the plants must be sprayed with carbendazim or baibai medicine to treat the insect pests. Put the phlox in a warm, humid, and airy climate. There are many insect pests in spring. Before the spring comes, the plants can be sprayed with carbendazim once every 10 days, which can effectively prevent insects.