What to do if the orchid leaves turn yellow and wither from the root? How to remedy the situation?
Orchid leaves turning yellow and withering from the base is a tricky problem that many horticulture enthusiasts encounter. This phenomenon not only affects the ornamental value but also serves as a health warning signal from the plant. This article will systematically analyze the root causes of yellow leaves and provide scientific treatment solutions through three sets of comparative images.
One, Emergency Response to Sudden Environmental Changes
1.1 Adaptation障碍 of New Orchids
Orchids purchased online or newly acquired often suffer root damage during transportation, leading to the yellowing of the base leaves first. In this case, the plant should be placed in a scattered light environment, maintaining a daytime temperature of 25-28°C and a nighttime temperature of 18-20°C.
1.2 Progressive Seedling Recovery Operations
Adopt a three-level humidity control method: maintain 80% air humidity in the first week, spray three times a day; reduce to 70% in the second week, spray twice; and return to normal maintenance in the third week. Use HB101 vitality factor 2000 times solution to assist in recovery.
Two, Comprehensive Disease Control System
2.1 Soft Rot Disease Identification Features
The typical symptom is the appearance of water-stained brown spots at the base of the leaves, accompanied by a foul smell. This disease is prone to occur in high temperature and humidity environments with poor ventilation, with an incidence rate as high as 35% in spring and autumn.
2.2 Staged Treatment Plan
Initial infection: immediately cut off the affected part and apply mancozeb ointment, spray 1000 times solution of kasugamycin every 7 days, for 3 consecutive times. For severe cases, use thiazole zinc suspension for root irrigation, combined with replacing sterilized planting materials.
Three, Root System Optimization Project
3.1 Soil Hardening Early Warning
When there is still excess water after 30 minutes of watering, or white salt deposits appear on the surface of the planting material, it indicates that the material is aging. It is recommended to use the golden ratio of pine bark: stone: decomposed leaf soil = 5:3:2.
3.2 Scientific Water Control Techniques
Use the bamboo stake test method: insert the bamboo stake into the planting material for 15 minutes and observe, with only the tip slightly moist being the best watering time. In winter, use a long-spout watering壶 to avoid water accumulation in the leaf heart.
By regularly observing the condition of the base leaves, the health status of orchids can be diagnosed in a timely manner. It is recommended to conduct a root system check-up monthly and adjust the maintenance plan according to seasonal changes. Maintaining proper ventilation and moderate lighting, combined with scientific water and fertilizer management, can keep orchids in a vibrant state.