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Cold damage and heat damage Early winter and early spring encounters chills, cold currents and persistent hypothermia, which exceeds the cold tolerance that orchid plants can tolerate, resulting in frost damage to orchid tissues or organs, and damage to blue leaves and death of whole plants. In summer, the temperature in summer is above 35°C, and blue leaves are burned by baking. The leaves are green or yellow, and orchids are dry.
Over-negative and long-lasting blue orchids have long been cultivated in sheds or blue rooms. Due to lack of light, orchid leaves are light green and their vitality is not prosperous. In the summer, the blue pots were placed in the open air or the shading of the sheds was too small, causing sunburn, causing the yellow leaves to yellow.
If drought and waterlogging are insufficient, the air is dry, causing the blue plant to grow slowly, dwarf, yellow, and even wilting. Watering is too frequent and the amount of water is too large, causing water in pots and lack of oxygen in the soil. This results in yellowish leaves and shedding of blue leaves, and severe root dead.
The lack of nutrients is the lack of nutrients. According to data, nitrogen deficiency in the nutrient of the planting material will cause the young leaves to be greenish, the old leaves to be yellow, and the plants to be prematurely decayed; the phosphorus-deficient leaves will be dark green and the growth period will be postponed; the lack of potassium tip will be dry and the leaves will have spots; Iron veins are chlorotic, even yellowish or whitish; young copper leaves are wilted and white spots appear.
Poisoning is polluted by harmful gases. The soil contains toxins, the blue plant has poor growth, the leaves burn, and the root system is damaged.
Finding the reasons, treating symptoms, remedying deficiencies, and overcorrecting are the basic principles for the prevention and treatment of orchid physiological diseases. It is required to provide as many conditions as possible for the growth of orchids in the cultivation and maintenance, and strive to create an excellent ecological environment suitable for the growth of orchids, that is, timely adjustment of light, temperature, humidity, pH, and water in accordance with different seasons and different growth periods. , Rational fertilization, pay attention to ventilation and ventilation, try to avoid or reduce the unscientific and unreasonable phenomenon caused by the disease. As long as these aspects are well grasped, there will be no physical disease. Even if there are occasional mismanagement and illnesses, it is not difficult to control and recover.
Physiological diseases of orchids, also known as non-invasive diseases, are diseases caused by unsuitable cultivation environments and conservation measures other than pathogenic organisms. If the temperature is too high or too low, the light is too strong or too weak, the water and fertilizer are imbalanced, the elements are lacking, the medication is not properly used, the harmful gases in the air, the toxic substances on the ground, etc. The types and symptoms of common physiological diseases of orchids include: