What are the physiological diseases in orchid culture?

What are the physiological diseases in orchid culture? Please introduce and guide the prevention and control methods of physiological diseases in the process of orchid culture, you can refer to the following introduction and control methods: 1. Sunburn: also known as sunburn, mainly caused by strong direct sunlight in midsummer. You can use a sunshade net to ensure that there is no direct sunlight. 2. The plant is weak: due to the lack of light, the stems and leaves of the diseased orchid plant grow only long, and the leaves become thin and yellowish green. Prevention and control measures: the diseased plant can be moved to a place where the light is sufficient, so that it can get more appropriate light. 3. Root rot: it is mainly caused by too much watering, the plant wilts and the root system is damaged by water, resulting in different degrees of root rot. Control method: immediately suspend watering, pour out the diseased plant, cut off the rotten root first, and then replace it with new soil and replant it. 4. Falling flowers and buds: it is usually caused by drastic changes in environmental conditions, such as the temperature and light suddenly become too low or too high, or too dry without watering for a long time. Prevention and treatment: improve the indoor environment, pay attention to ventilation or heat preservation, do not be too hot or too cold. In addition, maintaining high humidity and adequate watering is also an effective measure to prevent the occurrence of bud drop disease. 5. Plant shrinkage: it is mainly caused by drought and lack of water, which is characterized by dry and wrinkled fleshy air root, withered pseudobulb and loss of luster of leaves. The method of prevention and control is to replenish water immediately so that the orchid plant can be restored to its original state after fully absorbing water. 6. Frostbite: the tissues such as leaves, pseudobulbs and air roots showed water-stained necrosis after freezing. The control method is to cut off the withered roots and fallen leaves immediately, stop watering and keep them in a warm place above 15 ℃. 7. Scorched leaf tip or leaf edge: it is mainly caused by excessive sunlight, underwatering or too small basin, which is caused by the entanglement of roots, which is characterized by scorched and blackened leaf tip or leaf edge, and when serious, the scorched surface expands continuously, so that most of the leaves are scorched. Control method: first cut off the leaves of the scorched part and pay attention to spraying plants when watering to improve humidity. If the basin is too small, the basin should be changed in time to make the root system stretch and grow. Click to get more orchid planting techniques click to get more flower planting techniques