What are the common physiological diseases in orchid cultivation?
What physiological diseases occur in orchid cultivation? Please introduce them and provide guidance on prevention and control methods. For physiological diseases during orchid cultivation, you can refer to the following introduction and prevention and control methods: 1. Sunscald: also known as sunburn, mainly caused by scorching from strong direct sunlight in midsummer. It can be blocked with a shade net to ensure that no direct...
What physiological diseases occur in orchid cultivation? Please introduce them and provide guidance on prevention and control methodsFor physiological diseases during orchid cultivation, you can refer to the following introduction and prevention and control methods:
1. Sunscald: also known as sunburn, mainly caused by scorching from strong direct sunlight in midsummer. It can be blocked with a shade net to ensure that no direct sunlight enters.
2. Weak plants: caused by insufficient light. Affected orchid plants grow excessively tall stems and leaves, and the leaves become thinner and turn yellow-green. Prevention and control measures: move the affected plants to a place with sufficient light so that they receive more appropriate light.
3. Root rot: mainly caused by overwatering. The plants wilt, and the root system is damaged by water soaking, resulting in varying degrees of root rot. Prevention and control method: immediately stop watering, take the affected plant out of the pot, first cut off the rotten roots, then replace with new soil and replant.
4. Flower and bud drop: usually caused by drastic changes in environmental conditions, such as temperature and light suddenly becoming too low or too high, or excessive drought due to no watering for a long time. Prevention and control method: improve the indoor environment, pay attention to ventilation or insulation, and avoid being too hot or too cold. In addition, maintaining high humidity and sufficient watering are also effective measures to prevent bud drop.
5. Plant shrinkage: mainly caused by drought and lack of water, manifested as dry and wrinkled fleshy aerial roots, shriveled pseudobulbs, and lusterless leaves. The prevention and control method is to replenish water immediately so that the orchid plant absorbs enough water and returns to its original appearance.
6. Freeze injury: manifested as water-soaked necrosis after tissues such as leaves, pseudobulbs, and aerial roots are frozen and damaged. The prevention and control method is to immediately cut off the frozen dead roots and withered leaves, stop watering, and place the plant in a warm place above 15°C for care.
7. Scorched leaf tips or leaf margins: mainly caused by excessive sunlight, or insufficient watering or too small a pot causing the root system to become tangled together. It is manifested as scorched and blackened leaf tips or leaf margins, and in severe cases the scorched area continuously expands, causing most of the leaf to become scorched. Prevention and control method: first cut off the scorched parts of the leaves, and pay attention to spraying the plant when watering to increase humidity. If the pot is too small, repot it promptly so that the root system can spread out and grow.
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